Mark Greaney

Mark Greaney is an American author known for his "Gray Man" series of action thriller novels, which feature assassin and CIA operative Court Gentry. He also co-authored Tom Clancy's final works and continued the "Ryanverse" after Clancy's death. Greaney has degrees in political science and international relations, and has traveled extensively for his research, training alongside military and law enforcement. His books are published in nearly two dozen languages and have been adapted into film and television.