Mark “Oz” Geist is a U.S. Marine Corps veteran, Benghazi survivor, and New York Times bestselling co-author of “13 Hours: The Inside Account of What Really Happened in Benghazi,” which inspired the major motion picture “13 Hours: The Secret Soldiers of Benghazi.” A Colorado native and former police chief, Geist helped save more than 25 American lives during the 2012 Benghazi terrorist attack. He is also the co-founder of the Shadow Warriors Project, a nonprofit dedicated to supporting injured private security contractors and their families.