Sierra Six

Mark Greaney has a degree in international relations and political science. In his research for his novels, he traveled to more than thirty-five countries and trained alongside military and law enforcement in the use of firearms, battlefield medicine, and close-range combative tactics. He is also the author of the New York Times bestsellers Tom Clancy Support and Defend, Tom Clancy Full Force and Effect, Tom Clancy Commander in Chief, and Tom Clancy True Faith and Allegiance. With Tom Clancy, he coauthored Locked On, Threat Vector, and Command Authority. His first novel, The Gray Man, was made into a major motion picture starring Ryan Gosling and Chris Evans.