Ivan Reitman is a Canadian film director, producer, and actor. He is best known for directing the comedy films Stripes (1981), Ghostbusters (1984), Twins (1988), Kindergarten Cop (1990), Dave (1993), Six Days Seven Nights (1998), Evolution (2001), and My Super Ex-Girlfriend (2006). He also served as a producer for later projects, including Beethoven (1992), Junior (1994), Father's Day (1997), Old School (2003), and Up in the Air (2009). Reitman has received two Academy Award nominations for Best Original Screenplay for Ghostbusters and Dave.