John Christopher Reilly (born May 24, 1965) is an American actor, comedian, singer, voice actor, screenwriter, and producer who made his film debut in Brian De Palma's war film Casualties of War (1989). Reilly gained exposure through his supporting roles in Days of Thunder (1990), What's Eating Gilbert Grape (1993), and The River Wild (1994). He also starred in Paul Thomas Anderson's films, Hard Eight (1996), Boogie Nights (1997), and Magnolia (1999). For his performance in Chicago (2002), Reilly was nominated for the Academy Award for Best Supporting Actor and the corresponding Golden Globe Award. He worked with director Martin Scorsese on both Gangs of New York (2002) and The Aviator (2004).