A prominent engineer with 55 years experience, in charge of the design of hundreds of major building projects including high rise offices, former member of the California Seismic Safety Commission and former member of the National Institute of Sciences Building Safety Council (Marx Ayres) believes that the World Trade Centers were brought down by controlled demolition (see also this)

Two professors of structural engineering at a prestigious Swiss university (Dr. Joerg Schneider and Dr. Hugo Bachmann) said that, on 9/11, World Trade Center 7 was brought down by controlled demolition (translation here)

Kamal S. Obeid, structural engineer, with a masters degree in Engineering from UC Berkeley, of Fremont, California, says:

"Photos of the steel, evidence about how the buildings collapsed, the unexplainable collapse of WTC 7, evidence of thermite in the debris as well as several other red flags, are quite troubling indications of well planned and controlled demolition"
Ronald H. Brookman, structural engineer, with a masters degree in Engineering from UC Davis, of Novato California, writes:

"Why would all 110 stories drop straight down to the ground in about 10 seconds, pulverizing the contents into dust and ash - twice. Why would all 47 stories of WTC 7 fall straight down to the ground in about seven seconds the same day? It was not struck by any aircraft or engulfed in any fire. An independent investigation is justified for all three collapses including the surviving steel samples and the composition of the dust."
Graham John Inman, structural engineer, of London, England, points out:

"WTC 7 Building could not have collapsed as a result of internal fire and external debris. NO plane hit this building. This is the only case of a steel frame building collapsing through fire in the world. The fire on this building was small & localized therefore what is the cause?"
Paul W. Mason, structural engineer, of Melbourne, Australia, argues:

"In my view, the chances of the three buildings collapsing symmetrically into their own footprint, at freefall speed, by any other means than by controlled demolition, are so remote that there is no other plausible explanation!"
Mills M. Kay Mackey, structural engineer, of Denver, Colorado, points out:

"The force from the jets and the burning fuel could not have been sufficient to make the building collapse. Why doesn't the media mention that the 11th floor was completely immolated on February 13th, 1975? It had the weight of nearly 100 stories on top of it but it did not collapse?"
Haluk Akol, Structural Engineer and architect (ret.)

Charles Pegelow, structural engineer, of Houston, Texas (and see this)


Dennis Kollar, structural engineer, of West Bend, Wisconsin

Doyle Winterton, structural engineer (retired)

Michael T. Donly, P.E., structural engineer

William Rice, P.E., structural engineer, former professor of Vermont Technical College

There are many other structural engineers who have questioned the government's account in private. We support them and wish them courage to discuss these vital issues publicly.