Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Taking Measure

Just a Standard Blog

Richard G. Gann

white haired man with glasses and a beard

Richard G. Gann is the retired chief of the Fire Science Division at the National Institute of Standards and Technology (NIST). His 49-year career runs the gamut from basic fire science to its application in fire safety standards. Among his 148 technical publications, he was the editor of the final NIST reports: The Collapses of the World Trade Center Towers and The Collapse of World Trade Center Building 7, and the 1200-page Advanced Technology for Fire Suppression in Aircraft.

Reconstructing the Fires That Brought Down WTC 1, 2 and 7

September 8, 2021

Everyone has a story about where they were when they heard about the disaster universally called “9/11.” Mine begins in Ottawa, Canada. As chance would have it

Our Science in Your Inbox

Subscribe to our weekly emails.