Vincent Joseph Dunn (born May 12, 1935) is a retired firefighter who served the New York Fire Department for 42 years, rising in rank to Commander of Division 3 (Midtown Manhattan).
[1][2] Chief Dunn is an internationally recognized expert on high-rise firefighting, rescue, and building collapse.
The National Institute of Standards and Technology (NIST), an agency of the United States Department of Commerce, selected him to serve as a consultant in its investigation into the collapse of the World Trade Center's Twin Towers and 7 World Trade Center.
A modern open-floor office design, with cubicle work stations and dwarf partitions that do not extend to the ceiling, allows fire to spread throughout an entire 100 × 200-foot floor area.
A fully involved, free burning 20,000-square-foot floor area cannot be extinguished by a couple of firefighters spraying a hose stream from a stairway.
We are literally treating the steel removed from the site like garbage, not like crucial fire scene evidence.