We speak with Executive Producers Caroline Marsden and TJ Martin about their groundbreaking, documentary series, 9/11: One Day in America, commemorating the 20th Anniversary of the terror attacks with first-person testimony from survivors and first responders, as well as footage– some of it never-before-seen– from that fateful day.
The series will re-air on National Geographic on Sept. 10 & Sept. 11.
