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: Prime, Wet Hot American Summer: First Day of Camp, Spanking the Monkey, The Baxter and Revolution

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: Run Fatboy Run, Kimi, Slumberland, Kevin (Probably) Saves the World and Night Court

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: Hamilton, Altered Carbon, She-Hulk: Attorney At Law, Waves and The House with a Clock in Its Walls

Credits include: Zoey's Extraordinary Playlist, What/If, Zoey's Extraordinary Christmas, Brilliant Minds and Zoey's Extraordinary Best Friend

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