John Christopher McGinley (born August 3, 1959) is an American actor, author and former comedian. He is most notable for his roles as Perry Cox in Scrubs, Bob Slydell in Office Space, Captain Hendrix in The Rock, Sergeant Red O'Neill in Oliver Stone's Platoon and Marv in Stone's Wall Street. He has also written and produced for television and film. Apart from acting, McGinley is also an author, a board member and international spokesperson for the Global Down Syndrome Foundation, and a spokesperson for the National Down Syndrome Society.