Peter Killian Gallagher is an American actor, musician and writer. Since 1980, Gallagher has played many roles in numerous Hollywood films. He starred as Sandy Cohen in the television drama series The O.C. from 2003 to 2007. He currently appears in a recurring role on the USA Network drama Covert Affairs as CIA Clandestine Services Director Arthur Campbell...(Wikipedia)

Credits include: Back to the Future Part III, Elf, Philadelphia, Step Brothers and What's Eating Gilbert Grape

Credits include: The Proposal, The Lost City, Disenchanted, Fred: The Movie and Miss Stevens

Credits include: Pitch Perfect, Hamlet 2, 21 and Over, Crazy Ex-Girlfriend and Ghosts of War

Credits include: Brittany Runs a Marathon, The Union, Zoey's Extraordinary Playlist, Safe & Sound and My Adventures with Superman

Credits include: The Patient, Zoey's Extraordinary Playlist, Cristela, Zoey's Extraordinary Christmas and Intake

Credits include: Don't Breathe, Evil Dead, I Don't Feel at Home in This World Anymore, Castle Rock and Fun Size

Credits include: Another Simple Favor, Zoey's Extraordinary Playlist, Geography Club, Zoey's Extraordinary Christmas and The Glee Project

Credits include: The Philosophers, Man Seeking Woman, Premature, Straight Up and The Carrie Diaries

Credits include: The Lost Coast Tapes, Zoey's Extraordinary Glitch, Zoey's Extraordinary Distraction and What's Life Got to Do with It?

Credits include: Zoey's Extraordinary Playlist, Zoey's Extraordinary Christmas, Zoey's Extraordinary Dreams, Zoey's Extraordinary Distraction and Zoey's Extraordinary Boss

Credits include: Zoey's Extraordinary Playlist, Night Court, Zoey's Extraordinary Christmas, Night Court: Pilot and Zoey's Extraordinary Boss