Mark Greaney

Mark Greaney's research for the Gray Man novels, including Midnight Black, The Chaos Agent, Burner, Sierra Six, Relentless, One Minute Out, Mission Critical, Agent in Place, Gunmetal Gray, Back Blast, Dead Eye, Ballistic, On Target, and The Gray Man, has taken him to more than thirty-five countries, and he has trained alongside military and law enforcement in the use of firearms, battlefield medicine, and close-range...