Ike Richardson has been at the Los Alamos National Laboratory as deputy director since 2009.
But before coming to LANL, Richardson spent 31 years of his life in the U.S. Navy, where he attained the rank of Rear Admiral.
Back in 2001, he had just completed a tour on the USS Nimitz, a nuclear-powered aircraft carrier and he was starting his new job at the Pentagon at the beginning of September.
He and his wife Donna had just moved to the Washington area and they were staying in a hotel in Crystal City, Va., within walking distance of the Pentagon.
Sept. 11 started like any other morning for Richardson. He was in his office on the fourth floor early for a staff meeting.