Note: The author is indebted to a few particularly useful sources of information and inspiration, including Russ Baker's book "Family of Secrets", the websites nndb.com, sourcewatch.org and secinfo.com, and Richard Gage.
On occasion, the public has been asked by George W. Bush to refrain from considering certain conspiracy theories. Bush has made such requests when people were looking into crimes in which he might be culpable. For example, when in 1994 Bush's former company Harken Energy was linked to the fraudulent Bank of Credit and Commerce International (BCCI) through several investors, Bush's spokeswoman, Karen Hughes, shut down the inquiry by telling the Associated Press -- "We have no response to silly conspiracy theories." On another occasion, Bush said in a televised speech -- "Let us never tolerate outrageous conspiracy theories concerning the attacks of September the 11th."
But paradoxically, we have also been asked to believe Bush's own outrageous conspiracy theory about 9/11, one that has proven to be false in many ways. One important way to see the false nature of Bush's conspiracy theory is to note the fact that the World Trade Center buildings could only have fallen as they did through the use of explosives. A number of independent scientific studies have pointed out this fact [1, 2, 3, 4], but it was Bush's own scientists at the National Institute of Standards and Technology (NIST), through their inability to provide a convincing defense of the official line, who ultimately proved that explosives were necessary. [2, 5, 6, 7]
This leads us to ask the obvious question -- Who could have placed explosives in the World Trade Center towers? To answer that question, we should first consider who had access to the buildings, specifically the areas of the buildings that would be relevant to a demolition operation. We should also consider the time periods of interest. Those who had access at the necessary times should be further considered in terms of their ability to obtain the necessary explosive technologies and expertise, their ability to be secretive, and the possibility that they could have benefited from the destruction of the WTC buildings or from the resulting War on Terror. But one thing is certain, unless it was done by one person acting alone, it must have been a conspiracy.
The Twin Towers and WTC 7, all highly secure buildings, were most readily accessed by tenants, security and building management staff, and construction-related contractors.
Evidence suggests that the period of interest should include the years between the 1993 WTC bombing and September 11th, 2001. This evidence includes the warning from 1993 bombing conspirator Nidal Ayyad, who reportedly wrote -- "next time it will be more precise."  Additionally, evidence of a multi-year plot included the detailed information that FBI informant and mafia kingpin Gregory Scarpa Jr. received while in jail, as early as 1996, from Al-Qaeda operative Ramzi Yousef, while imprisoned in the adjacent cell. Yousef described plans to "bring New York to its knees" by blowing up the World Trade Center with American-owned "flying massive bombs." Scarpa Jr. provided this information to Assistant US Attorney Patrick Fitzgerald and FBI Counsel Valerie Caproni, who were apparently not interested.  Another example is the recorded conversation between FBI informant Randy Glass and Pakistani ISI agent Raja Gulum Abbas, in which Abbas claimed "Those towers are coming down", indicating that a plan was in progress as of July 1999. 
Throughout the life of the WTC buildings, modifications were made to each structure. The modifications included upgrades to electrical, fire protection, and elevator systems, as well as general construction activities. As a rule, the Port Authority of New York and New Jersey (PANYNJ) was responsible for initiating the modifications in the public access areas, and the tenants were responsible for completing the modifications throughout the leased spaces.  For this reason, the tenant companies would have been capable of coordinating the installation of explosive materials and other devices with reasonable certainty that those materials would not be detected by others. For a demolition plan to work, however, such tenants would need to be managed as a group, and explosives would need to be placed on enough floors to ensure the fall of each building through what would otherwise have been the path of most resistance.
While examining the tenants in each critical area, we should ask – Cui Bono? That is, who benefited from the destruction of the WTC buildings, and the resulting War on Terror? The obvious answer includes, primarily, the Bush Administration and its friends. It also includes overlapping groups of oil and gas companies, defense contractors, and those who desired to wield undue influence on international policies related to a wide number of issues from civil rights to space domination.
The North Tower Impact Zone
On 9/11, American Airlines Flight 11 hit the north face of the north tower (WTC 1) between floors 94 and 99. In a stunning coincidence, these floors bracket those that had been upgraded for fireproofing shortly before 9/11.  This coincidence was amplified by the fact that one tenant occupied all of those floors – Marsh & McLennan (Marsh), which at the time was the world's largest insurance brokerage company. One other tenant, Sumitomo Bank, shared part of floor 96 with Marsh.
During the years from 1993 to 2001, Marsh made several modifications to these floors, in addition to the fireproofing upgrades mentioned above. According to the National Institute of Standards and Technology (NIST), Marsh made modifications to the south side of floor 94 in 1998. That same year, the PANYNJ helped Marsh demolish floors 95-98 in order to rebuild the fire alarm and sprinkler systems. Marsh did further modification work on floor 95 in the year 2000.  The full floor fireproofing upgrades on floors 93 through 100 were accomplished in August through November of 1998, except for floor 94, which was done in December 1996.
Marsh was a large company, with a number of subsidiaries, including Putnam Investments, Mercer, Johnson & Higgins, and Guy Carpenter, a company that occupied floors 47 to 54 of the south tower. Marsh was also known to be notoriously secretive, and had been likened to the CIA.  Its chief executive on 9/11 was Jeffrey Greenberg, a member of the Brookings Institution, the Trilateral Commission, and the son of the chairman of American International Group (AIG), Maurice Greenberg. AIG has been reported to be at the center of a number of CIA operations. 
Jeffrey Greenberg rose quickly through management at Marsh, having come there directly from AIG in 1995, and then becoming CEO just four years later. At Brookings, Greenberg hobnobbed with Lee Hamilton, co-chair of the 9/11 Commission, and the Iraqi Nemir Amin Kirdar, CEO of Investcorp, a BCCI-related company founded by the Saudi Abdullah Taha Bakhsh. 
BCCI was founded by a Pakistani named Agha Hasan Abedi, and was "made up of multiplying layers of entities, related to one another through an impenetrable series of holding companies, affiliates, subsidiaries, banks-within-banks, insider dealings and nominee relationships." In the early nineties, BCCI was extensively investigated for money laundering and terrorist financing, and was ultimately shut-down by the Bank of England in 1992.  Like BCCI, AIG developed the same fragmented and difficult to trace network of subsidiaries, spread across 130 countries and 400 regulators. 
Other very powerful and well-connected people worked in senior management at Marsh. These included Stephen Friedman, a senior principal at Marsh Capital and former partner at Goldman Sachs, who later became George W. Bush's top economic advisor. Friedman was also a member of the Brookings Institution, the Bilderberg group, the Foreign Intelligence Advisory Board, and the board at In-Q-Tel, the investment firm founded by the CIA in 1998. In-Q-Tel invests in state of the art technologies related to defense and intelligence work, including nano and chemical technologies, according to its website. 
In another interesting coincidence, Friedman belonged, through Cornell University, to a secret society called Quill and Dagger, the membership of which includes Paul Wolfowitz, Sandy Berger and Stephen Hadley. Wolfowitz, the neo-con deputy secretary of defense in the Bush Administration, was the author in 1992 of the "Wolfowitz Doctrine" of pre-emptive warfare. He also made comments about a "surprise like Pearl Harbor" months before 9/11, and met with Pakistani ISI General Mahmud Ahmed in the week before 9/11.  Berger, the National Security Advisor to President Clinton, was later caught stealing documents from the 9/11 Commission investigation.  Berger was also the boss of White House counterterrorism Tsar Richard Clarke, and together with Hadley - who was Condoleezza Rice's deputy - was responsible for delaying or obstructing Clarke's plans to stop Al Qaeda in January 2001. 
The President of Marsh Real Estate Advisors, from 1982 to 2001, was Craig Stapleton, the husband of George W. Bush's cousin, Dorothy Walker Bush. Stapleton's Marsh division was responsible for negotiating office leases in the US, Canada and Europe. He once co-owned the Texas Rangers with George W. Bush, a spectacular investment for all involved. In 1997, Stapleton was a member of the board of a company called Cendant that was charged in 1998 with massive accounting fraud. The President of Cendant at the time was Henry Silverman, a former partner of the Blackstone Group and later Vice Chairman of the PANYNJ. Stapleton went on to join Winston Partners, a privately owned investment firm founded in 1993 and led by George W. Bush's bother Marvin.
The Vice Chairman of Marsh on 9/11 was Mathis Cabiallavetta, a Swiss citizen. Although Cabiallavetta was a member of the Marsh board from 1993 to 2000, he took his position as Vice Chairman in 1999, after having been President of the Union Bank of Switzerland (UBS) from 1996 to 1998. This was the same UBS that bailed out George W. Bush's Harken Energy in 1987, with the help of billionaire Jackson Stephens. UBS was linked in other ways to the fraudulent terrorist financing bank BCCI. [16,23]
Another connection to the Bush family can be seen in the Marsh acquisition of the New York insurance brokerage Johnson and Higgins in March 1997. Johnson and Higgins was the long-time employer of Prescott Bush Jr, brother to George H. W. Bush. Although Prescott Jr. no longer worked there, he had spent 33 years at Johnson & Higgins, retiring as Senior Vice President. After retirement, Bush continued to consult for the company, in Asian dealings. With Prescott Jr, Friedman and Stapleton, Marsh clearly had strong ties to the Bush network. Additionally, it seems possible that some members of Marsh management, particularly Stephen Friedman, through In-Q-Tel, had access to technologies that could have been used to bring about the deceptive demolition of the WTC buildings.
Add to this L. Paul Bremer, and the possible Marsh ties to demolition technology become clearer. One month after 9/11, Bremer would become the CEO for a new division called Marsh Crisis. Interestingly, the Yale graduate Bremer had been working to complete the National Report on Terrorism, and prior to that had been managing director for Kissinger Associates. According to a US Senate report, Kissinger Associates had a number of meetings with BCCI representatives in the late eighties and early nineties, and it refused to provide documents requested by the Senate investigators.  Bremer was also a member of the board for Akzo Nobel, the parent of International Paint, a company that produced a fireproofing application for skyscrapers called Interchar. 
Bremer was on the international advisory board for the Japanese mining and machinery company, Komatsu. At the time, Komatsu had been involved in a joint venture agreement with Dresser Industries, the oil-services/intelligence front in which Prescott Bush Sr. and George H. W. Bush got their start with Neil Mallon. The Komatsu-Dresser mining division operated from 1988 to 1997. In July 1996, it patented a thermite demolition device that could "demolish a concrete structure at a high efficiency, while preventing a secondary problem due to noise, flying dust and chips, and the like."  Residues of thermite, the highly energetic chemical mixture, have been confirmed in samples of the WTC dust, and the use of thermite at the WTC was also revealed by environmental data. [1, 2, 3, 4, 26] Dresser Industries merged with Dick Cheney's Halliburton in 1998.
It is less well known that Bremer's relationship to Marsh started earlier. In fact, on 9/11, Bremer was the CEO of Marsh Political Risk Practice and he had an office in the south tower. That day, he was interviewed on NBC television, stating that Osama bin Laden was responsible and that possibly Iraq and Iran were involved too, and he called for the most severe military response possible. Google removed the interview video from its servers three times, and blocked it once. 
Bremer was called away from Marsh in 2003, to be the Iraq Occupation Governor. His work in that role has been widely criticized. 
The South Tower Impact Zone
United Airlines Flight 175 hit the south tower (WTC 2) between floors 78 and 83, in the southeast corner of the building. In the impact zone, Baseline Financial Services (Baseline) was located on floors 77 and 78, Fuji Bank was on floors 79 to 82, and AON Corporation was on floor 83.
Baseline was led by a very interesting individual named Joseph Kasputys, who had a history of being well connected to the highest levels of government, as well as to defense and intelligence industries. Kasputys worked, from 1972 to 1977, for the US departments of commerce and defense. He was also the deputy director of Nixon's White House taskforce that dealt with the Arab oil embargo of 1973, and he was instrumental in the creation of the Department of Energy (DOE).
Kasputys' connections to the DOE, from 1977 through at least 1997, are interesting considering that the DOE was developing thermite ignition devices as early as 1983.  Additionally, national laboratories working within the DOE developed nanothermites in the late 1990s. Nanothermites are explosive thermite mixtures where one or more reactants are present at the nanometer scale. These are also called super-thermites due to the extraordinarily large amount of energy released upon ignition. [3, 30]
Kasputys was also a member of the Logistics Management Institute (LMI), whose members included Paul Kaminski of In-Q-Tel and General Dynamics, Charles DiBona of Halliburton, Skull and Bones member Joseph Samuel Nye, and Michael Daniels of Science Applications International Corporation (SAIC). It has been noted that SAIC, a defense contractor with expertise in thermite-related technologies, played a large part in the NIST WTC investigation. LMI's self-proclaimed role is "advancing the science of government." [30, 31]
Better known for his leadership of Primark Corporation from 1987 to 2000, Kasputys was CEO for both companies after the Primark acquisition of Baseline in 1996. Primark owned as many as 50 companies during that time, and was acquired by Thomson Financial in June 2000. Kasputys then became CEO for Thomson, and he later founded the intelligence-services company IHS Global Insight, in March 2001. Another Primark company, Primark Decision Economics, was located in the 11th floor of the north tower.
The sheer number of companies involved with Primark, along with the vague business descriptions given (Baseline was described as "an international provider of information"), gave the impression that something more than legitimate business was involved. Primark owned Triad International Maintenance Company (TIMCO), a company that, among other things, modified Boeing 757s and 767s. Primark also owned The Analytic Sciences Corp (TASC), a security and intelligence (spying) company that had contracts with the DOE. As CEO of World Markets Research Centre, Kasputys predicted in 2003 that the US was the country with the fourth-highest risk of terrorism, and that – "Another September 11-style attack in the US is highly likely." 
According to NIST, Kasputys' Baseline modified the southeast corner of floor 78 in 1999, exactly where the aircraft hit on 9/11.  Floors 77 and 78 were upgraded for fireproofing in June and April of 1998, respectively.
Another company with an office on floor 78 was First Commercial Bank. This was a Taiwanese national bank that had, in January 1998, privatized all but one third of its shares. The other two thirds went to First Commercial Financial Corp (FCFC) of Seguin, Texas. Unfortunately, it is not clear if FCFC is related to First Commercial Financial Group (FCFG), owned by Abdullah Taha Bakhsh. FCFG was a commodities brokerage firm that was forced to distribute its customer accounts in 1994, after regulators raised concerns about capital shortfalls and customer complaints. .
Interestingly, another company located in Seguin, Texas is the machinery manufacturing company, the Alamo Group. Dave Grzelak, CEO of Komatsu-Dresser, was a director at Alamo. He was also a board member at Aoki Construction Co, a mining company associated with Prescott Bush Jr, as we'll see below.
The tenant located just above Baseline, on floors 79 to 82, was Fuji Bank. Fuji modified the core of floor 78 in 1998, the east wall of floor 80 in 1999, unknown parts of floor 80 in 2001, and the southeast corner of floor 82 in 1997. 
Prior to the year 2000, Fuji Bank was the second largest bank in Japan. Fuji's largest investors were Union Carbide, Mobil Oil and Raytheon. In 1996, Yasuda Trust became a Fuji subsidiary and in September 2000, Fuji merged with Dai-ichi Kangyo Bank (DKB), and the International Bank of Japan (IBJ), to form the largest bank in the world under the name of Mizuho Holdings. The second largest at the time was the Sumitomo-Mitsui Banking Corp, formed in October 1999. But the Fuji Bank merger meant that, as of 9/11, Mizuho Holdings controlled companies not only in the impact zone of the south tower, but also on floors 48 to 50 of the north tower by way of DKB.
Toru Hashimoto, chairman of Fuji Bank, was also with Deutsche Securities Limited Tokyo Branch and is now on the board of Deutsche Bank with Norman Augustine. Augustine, also known for being the CEO of Lockheed Martin, was founder of In-Q-Tel and a board member of Riggs National, the banking firm of Jonathan Bush, the other brother of George H. W. Bush. A 2004 expose by the New York Times revealed Saudi Arabian accounts at Riggs were being investigated for money-laundering and possible financing of the September 11th terrorists. 
Deutsche Bank was the bank of the German Gestapo during World War II, funding the construction of concentration camps. It was broken up after the war, only to merge together again in 1957.  In 1998, Deutsche Bank added Banker's Trust, which had purchased Alex Brown and Sons in 1997, to its group of companies. It was Deutsche Bank and these subsidiaries that were identified as being involved in insider trading related to the 9/11 attacks. The person of most interest in these dealings was A.B. Krongard, the CEO of Alex Brown, and CIA counsel to George Tenet.  From 2001 to 2004, Krongard was executive director of the CIA. Another significant player was Wolfgang Demisch, managing director at Alex Brown from 1993 to 1998, managing director at UBS Securities from 1988 to 1993, and member of the board at SAIC.
Fuji Bank had a history, in the early 1990s, of scandal related to fraudulent loans and gangster connections. It had also been linked to large CIA-related payments deposited in the Cayman Islands, and to the BCCI connected First American Bank. [38, 39, 40]
Moreover, Fuji Bank was not the only Mizuho company that was accused of criminal activity. In June 1997, executives of DKB were accused of conspiring to provide $80 million in loans to Ryuichi Koike, a Japanese gangster. Koike used the money to purchase shares in securities brokerages, like Nomura, Nikko (located on floor 79 of the north tower), and Daiwa. Some reports put DKB's extorted loans to Koike at $272 million.  DKB was reported to have made loans to other Yakuza crime syndicates as well, and in June 1997, the chairman of DKB ultimately resigned over the scandal. 
Additionally, Mizuho subsidiary IBJ was discovered to have generated $2.5 billion in fraudulent loans to a businesswoman named Nui Onoue in 1991. IBJ was also reported to have indirectly supported predatory lending by securitizing high-loan-to-value loans to companies like Dallas' FirstPlus Financial, a company that shot to financial stardom in 1996 and then collapsed in 1999. Dan Quayle was on the board of directors. 
Back in the summer of 1989, while his brother was President, Prescott Bush Jr. was the middleman in the takeover of two companies by West Tsusho, a Tokyo-based investment firm linked to one of Japan's biggest mob syndicates. West Tsusho was part of the empire of Susumu Ishii, head of the Inagawa-kai yakuza gang. In 1992, two days after an article linking him to Bush appeared in the Daily Yomiuri, Ishii was dead, reportedly from a "long illness." 
At the time, The Boston Globe reported that Prescott Bush Jr. had also been a business partner with Tokyo-based Aoki Construction Corp (Aoki), in its deals to build in China. Masahiro Sakane, now the CEO of Aoki, was managing director at Komatsu from 1994 to 1999. Komatsu and Aoki shared many other links in management.
The two companies West Tsusho acquired through Prescott Bush Jr., were Quantum Access (of which Bush was a board member) and Asset Management International. As a consultant for Asset Management, Prescott introduced Hughes Aircraft to Japanese investors in a deal in which Hughes and the government of China would launch satellites that would beam television programming to broadcasters in China. [45, 46] In December 1989, President Bush lifted the sanctions that blocked the satellite deal, citing "the national interest." The Bush administration had earlier granted Hughes Aircraft "preliminary licenses" to exchange data with Chinese officials.  Also involved in the West Tsusho mob dealings was Nikko Securities (floor 79 of the north tower).
After his death, West Tsusho's Susumu Ishii was replaced as the leader of the Inagawa-kai gang by Toi Inagawa. In September 1996, Inagawa formed an alliance with Yoshinori Watanabe, head of the largest yakuza gang, Yamaguchi-gumi. Nui Onoue, who received the fraudulent loans from Mizuho's IBJ, was said to be associated with Yamaguchi-gumi's Takumi gang, and also an investor in Inagawa-kai. 
Japanese Banks had experienced a relatively tough time in the 1990s, referred to in financial circles as "the lost decade", and in general were still doing badly in the years 2000 and 2001. In November 2000, Mizuho Holdings had problem loans and bad debts of more than 4 trillion yen ($36 billion). By mid-2001, the company was trading at half the value it had been at just a year before, when the merger was announced. [48, 49] Japan's financial system began to recover in 2002. 
Moving to floor 83 of the south tower, there was AON Corporation, a Chicago-based competitor of Marsh. Today, General Richard Myers, one of the people most responsible for not protecting us on 9/11, is a director at AON. But on 9/11, the most interesting character working for AON was Jim Pierce, the cousin of George W. Bush. Jim's father Scott Pierce, formerly a partner at G.H. Walker & Co, pled guilty to 2,000 counts of mail fraud in 1985, as President of E.F. Hutton.
Jim Pierce was managing director of AON on 9/11, and he had arranged a meeting on the 105th floor of the south tower for that morning. Pierce survived that day, despite the fact that twelve people came to the meeting in the south tower, and eleven of them died. The location of the meeting had been changed, the night before, to the Millenium Hotel, where Pierce watched the south tower as it was hit by the aircraft. Apparently the meeting attendees were not all notified of the change in location. 
AON modified "unknown" parts of floor 83 in 1997. Some photos of the impact zone suggest that the most explosive part of the fireball erupting from the south tower came from the east side of the building, near floor 83 (see NIST report NCSTAR 1-5A, figure 7-7).
Chuo Trust, which shared floor 83 with AON, was the trust portion of Mizuho's DKB. According to NIST, Chuo modified the southeast corner of floor 83 in 1999.
An unusual feature of the destruction of the south tower was the "cold spot" on the north face of the building. This section along a twelve-column area of floors 80, 81, 82 did not experience any fire, despite the fact that the areas on both sides did have fire. In its report NCSTAR 1-5, NIST "concluded that insufficient information is available to allow a likely formation mechanism for the cold spot to be postulated."
The Washington Group
Another company of interest, on floor 91 just above the impact zone for the south tower, was Washington Group International (Washington). This company was known primarily as a construction and mining firm, and it had just acquired Raytheon Engineers in July 2000. Raytheon was reported to have also occupied floor 91.
Washington had an interesting history. It had been a contractor for the DOE and its predecessor agencies since 1942, when it was involved in the Manhattan Project. In 1995, a management shake-up at Washington resulted in the temporary installment of William Clark as acting chairman. Clark was a member of the Center for Security Policy, along with many neo-cons including Richard Perle, Eliot Abrams, Norman Augustine (In-Q-Tel), Douglas Feith, and 9/11 Commissioner John Lehman. After re-organizing the management at Washington, in just a few months, Clark resigned.
In 1996, Washington took over Morrison-Knudsen, an engineering and construction company that had a history of working on large projects around the world, including in China, Iran, Afghanistan and Saudi Arabia. In Vietnam, Washington led the RMK-BRJ construction project with Brown & Root. During the 1980s, it worked closely on hazardous clean-up projects for the DOE. The Army Corps of Engineers hired Morrison-Knudsen to demolish over 200 buildings in 1995. 
In 1999, Washington acquired Westinghouse Government Environmental Services Company (WGESC), a firm that provided management services to the DOE and DOD. In July 2001, E. Preston Rahe, Jr, the President of WGESC, was promoted to Executive Vice President of Business Development for Washington Group's Government operating unit. Rahe went on to form a new company called Lawrence Livermore National Security, LLC, along with General John A. Gordon.
Gordon was George H. W. Bush's Senior Director for Defense Policy on the National Security Council, and he worked with George Tenet at the CIA from September 1996 to October 1997, as associate director of central intelligence for military support, and as deputy director of the CIA from October 1997 to 2000. During this time, Gordon would have worked closely with A.B. Krongard, who was Tenet's counsel from 1998 to 2001. Later, in 2003 and 2004, Gordon was George W. Bush's Homeland Security advisor.
Apart from Lawrence Livermore labs (LLNL), one of the DOE facilities for which Washington was responsible, well before 9/11, was the Savannah River site near Aiken, SC. In February 1997, LLNL and the Savannah River site signed an agreement of cooperation to share technology. Savannah went on to add "Developing sol gel technology for fuels and other applications" to its portfolio. [53, 54] Sol-gel technology is utilized by LLNL for making nanothermites.  In another coincidence, Savannah River Technology staff participated in the search and rescue operations at Ground Zero by providing unique tools. 
Today, Washington is owned by URS Corp, and they still "help manage and operate Idaho NL, LANL and LLNL," through a partnership with Battelle.  But just before 9/11 they were going through a tough time financially, and sought chapter 11 bankruptcy protection. Securities and Exchange Commission (SEC) documents show that Washington made court-ordered pre-petition payments, as part of these proceedings, to a number of companies including Komatsu. Washington also made payments to Greenhorne & O'Mara, whose employee Theresa McAllister was a lead author for the FEMA and NIST reports on the WTC disaster, and to Sumitomo Bank.  Sumitomo Bank was closely allied with Komatsu, and was involved with defense-related production. 
Other floors and companies of interest
If a "top down" demolition were implemented in the WTC's Twin Towers on 9/11, then it would have been necessary to plant explosives on floors below the impact zone. From a novice perspective, it would seem ideal to have planted such explosives at regular intervals below the impact area, around floor 50, for example, and below that around floors 25 to 35, and lower. Videos show "squibs" emanating in these general areas of each tower, at levels spaced between the mechanical floors on 41-42, and 75-76.
We have seen that Marsh occupied the impact zone for the north tower, and floors 47 to 54 of the south tower. Additionally, in a reflective criss-cross pattern, Fuji Bank's parent company Mizuho Holdings occupied the impact zone for the south tower, as well as floors 48 to 50 of the north tower (DKB). Primark Corporation occupied part of the impact zone for the south tower, and also floor 11 of the north tower.
To evaluate floors 25 to 35 of each tower we should note that, in 1997 and 1998, big leases were signed at the WTC involving AON, Marsh, and Bankers Trust, and two other companies of interest, Exco Resources and Oppenheimer & Co. At the time, tenancy had gone way up and the complex was expected to be at full capacity due to growth of the financial sector. 
Exco Resources (Exco), of Dallas Texas, was an oil and gas holding company that was the parent to Garban Intercapital, located on floor 25 and 26 of the north tower, and also on floor 55 of the south tower, just above Marsh subsidiary Guy Carpenter. Exco experienced rapid growth as of 1998, in part due to some very well connected management representatives. Member of the board Mark Neporent also represented Cerebrus Capital, along with Dan Quayle. Robert L. Stillwell, senior partner at Bush friend James Baker's firm Baker Botts, is currently a director at Exco.
Directors and Officers at Exco, during the period of interest, were associated with Enron affiliates, Anadarko Petroleum, a company owned and operated by long-time Bush family partner Robert Allison, and many other oil and gas exploration firms. Both Enron and Robert Allison met with Dick Cheney in regard to his secretive energy task force in early 2001.  In general, oil and gas exploration companies use explosives to underground create shock waves, so that oil reserves can be found through the seismic responses. Usually there is only a 10% success rate for finding new productive oil fields. 
Another Exco executive was Jeffrey Benjamin, who served on the board of Exco starting in 1998, and from 1996 to 1998 was managing director of UBS, the BCCI connected bank mentioned above with Mathis Cabiallavetta and Wolfgang Demisch. Just prior to working for UBS, Benjamin was managing director of Bankers Trust. Through Bankers Trust, he worked with A.B. Krongard, and as of 2002, Benjamin is a senior advisor to Apollo Management with Krongard's wife, Cheryl Gordon Krongard.
Oppenheimer & Co, an investment bank, was on floors 31 to 34 of the south tower. Oppenheimer's leadership once included Stephen Berger, former executive director of the PANYNJ (1985 to 1990). Berger was also on the board of Dresser Industries, the Bush dynasty firm, as well as being on the board of Forstmann Little & Co. with managing director of the Carlyle Group, Daniel Akerson, and with Alex Mandl of In-Q-Tel.
Oppenheimer was sold, by Stephen Robert and Nathan Gantcher, to the Canadian Imperial Bank of Commerce (CIBC) in 1997. Mr. Gantcher continued to serve as Vice Chairman of CIBC Oppenheimer from 1997 to 1999 and also served on the board of Jacobsen Partners with Gerald Parsky, the former undersecretary of the Treasury who introduced Saudi investors to America. Parsky developed a close relationship with the Bushes, and by 1976 was "the undisputed go-to man for the Saudis on oil and money." He also raised a lot of money for George W's campaign.  Parsky, Gantcher and Stephen Robert were all members of the Council on Foreign Relations as of 1997, along with Friedman, Bremer, Augustine, Gordon, and Maurice Greenberg (and about 3,000 others).
CIBC Oppenheimer was invested in a number of powerful and politically wired companies, including Hollinger International, whose board included Henry Kissinger, Richard Perle, and 9/11 Commissioner James R. Thompson. CIBC Oppenheimer was also invested in Robert Allison's Anadarko Petroleum, and several DKB subsidiaries including CIT Group, on whose board sits 9/11 Commissioner Thomas Kean. On a side note, Kean is also a Trustee of Drew University with Garnett Keith of Komatsu.
In 2003, the SEC fined CIBC Oppenheimer $80 million for helping to manipulate the financial statements of Enron.
Conclusions and next steps
If we look at the companies that occupied the impact zones of the WTC towers, and other floors that might have played a useful role in the demolition of the towers, we see connections to organizations that had access to explosive materials, and to the expertise required to use explosives. Mining companies like Washington, Morrison-Knudsen, Komatsu and Aoki Construction (and John Lehman's Special Devices Inc.) have access to many types of explosive materials. Oil and gas companies, like those associated with Exco, use explosives for exploration. Some of the explosive technologies available to these companies, for example Komatsu and Washington, involve thermite, a chemical mixture that has been identified in the WTC dust and in the environmental data at Ground Zero.
It seems that, if certain management representatives of the tenant companies listed above wanted to help bring the WTC towers down, they would have been well suited to do so. The companies mentioned were located at well-spaced intervals in the buildings, and some, for example Marsh and the Primark subsidiaries, had a reputation of being secretive. In fact, a number of the executives from these firms were either on the board of intelligence firms (e.g. In-Q-Tel, TASC), or were closely related to others who were. Others were connected to the CIA itself, and to some of the largest defense contractors in the world, like Lockheed Martin, Raytheon, General Dynamics, Halliburton, and SAIC.
There are also strong connections to those who benefited from the 9/11 attacks, most notably the Bush family and their corporate network, including Dresser Industries (now Halliburton) and UBS, and to Deutsche Bank and it subsidiaries, reported to have brokered the insider trading deals. There are links between these tenant companies and the terrorist-related fraudulent bank BCCI.
In Part II of this series of essays, we'll look at the security companies and other contractors that had access to the WTC buildings. We'll then see more connections to the Bush family, through the companies that restructured the security systems in the late 1990s, like Securacom, where Marvin Bush and Wirt Walker were directors. Also involved in these security upgrades was Ensec, where future Democrat National Committee chairman Terry McAuliffe was added as a director in 1996 and later worked for Harken Energy's Alan Quasha. The second essay will also look at E.J. Electric, owned by J. Robert Mann of the Yale Glee Club, and examine particulars about the PANYNJ management staff, and the Giuliani and Silverstein teams that were involved.
Part III will review the clean up of Ground Zero, and some of the people involved in the cover-up investigations. For example, we'll look more closely at Donald Evans, a close friend to George W. Bush since 1968 and his largest fund-raiser, and who also happened to be secretary of the Department of Commerce during the NIST WTC investigation. This is interesting because NIST reports to the Secretary of Commerce.
In the end, we might see that conspiracies are not just limited to the powerless people who happen to live on the most strategically important lands in the world. The conspiracies that matter might involve the powerful people who seek access to those lands, and who have spent their lives seeking more power.
Endnotes and references:
Kevin Ryan is the former Site Manager for Environmental Health Laboratories, a division of Underwriters Laboratories (UL). Mr. Ryan, a Chemist and laboratory manager, was fired by UL in 2004 for publicly questioning the report being drafted by the National Institute of Standards and Technology (NIST) on their World Trade Center investigation. In the intervening period, Ryan has completed additional research while his original questions, which have become increasingly important over time, remain unanswered by UL or NIST. More information http://www.ultruth.com/ feedback kncryan @ msn.com