Mark “Oz” Geist is a member of the Annex Security Team that fought the Battle of Benghazi, Libya, from September 11 to September 12, 2012, where he was credited with helping to save the lives of more than 25 Americans. Mr. Geist is still recovering from the injuries he sustained in the battle. He is a co-author of the bestselling book 13 Hours: The Inside Account of What Really Happened in Benghazi.