Patrick K. O'Donnell is a bestselling, critically acclaimed military historian and an expert on elite units. The author of twelve books, including The Unknowns and Washington's Immortals, and a Fellow at Mount Vernon, he is the recipient of numerous national awards. O'Donnell served as a combat historian in a Marine rifle platoon during the Battle of Fallujah and is a professional speaker on America's conflicts, espionage, special operations, and counterinsurgency. He has provided historical consulting for DreamWorks' award-winning miniseries Band of Brothers and for documentaries produced by the BBC, the History Channel, and Discovery.