Michael Shapiro is an American voice actor, most famous for the voices of Barney Calhoun and the G-Man in the computer games Half-Life, Half-Life: Opposing Force, Half-Life: Blue Shift, Half-Life: Decay, Half-Life 2, Half-Life 2: Episode One, and Half-Life 2: Episode Two. Games in which he is credited as "Mike Shapiro" are Blood II: The Chosen, its expansion pack, and Torin's Passage.