Marcus Luttrell is the author, who served in the SEAL Team 10, the main focus of the book. Born November 7, 1975. He knew that he would become a SEAL and started to train at 15 with a former soldier named Billy Shelton. He joined the military, to be in the Navy, in 1999. He has a brother named Morgan, they are twins, both served in the military. This book was the only book he published to my known knowledge.