 Slattery played Paul Moore, boyfriend of Katherine Watson (portrayed by Julia Roberts) in the film "Mona Lisa Smile", and he portrayed Howie in David Lindsay-Abaire's play, "Rabbit Hole".He had a small part as a teacher in the film "Sleepers".He also appeared as a government promoter in the Clint Eastwood feature "Flags of our Fathers" and as CIA official Henry Cravely in "Charlie Wilson's War".