His memoir, "Drone Warrior: An Elite Soldier's Inside Account of the Hunt for America's Most Dangerous Enemies" (Dey Street Books/HarperCollins Publishers), is on sale now. This article was ...

His new book, "Agent of Influence: How to Use Spy Skills to Persuade Anyone, Sell Anything, and Build a Successful Business" (Dey Street Books) goes on sale June 4th.