Served as associate editor of <i>Playboy</i> magazine
Performed with Chicago's Second City improvisational comedy troupe
Joined John Belushi and Bill Murray as writers and performers on "The National Lampoon Radio Hour" in New York City
Co-wrote and performed in the Off-Off Broadway revue "The National Lampoon Show"
Acted in and served as head writer for the syndicated late-night sketch-comedy series "SCTV Network"
First film as co-screenwriter, "National Lampoon's Animal House"; directed by John Landis and co-starred John Belushi
Feature directing debut, "Caddyshack"; co-starred Bill Murray and Chevy Chase
Co-wrote the camp comedy "Meatballs"; directed by Ivan Reitman and starring Bill Murray
Co-starred with Murray in first major film role "Stripes"; also co-wrote and re-teamed with Ivan Reitman
Produced the ABC special "The Rodney Dangerfield Show: It's Not Easy Bein' Me"; also co-wrote
Directed the hit comedy "National Lampoon's Vacation" starring Chevy Chase and Beverly D'Angelo
Co-wrote (with Dan Aykroyd) the summer hit "Ghostbusters" also co-starred with Aykroyd and Murray; directed by Ivan Reitman
Co-wrote the Rodney Dangerfield comedy "Back to School"
Helmed the comedy "Club Paradise" starring Robin Williams: also co-wrote
Executive produced and narrated "Will Rogers: Look Back in Laughter" (HBO)
Co-wrote the sequel "Caddyshack II"
Re-teamed with the original cast and director Ivan Reitman for "Ghostbusters II"; also co-wrote with Aykroyd
Re-teamed with Bill Murray to direct "Groundhog Day"; also produced and scripted
Directed Al Franken in "Stuart Saves His Family"; based on a sketch written by Franken for "Saturday Night Live"
Produced and directed "Multiplicity," starring Michael Keaton
Had a small role as a physician in "As Good As It Gets"; starred Jack Nicholson and Helen Hunt
Directed Billy Crystal and Robert De Niro in the comedy "Analyze This"; also co-wrote
Wrote, directed and produced a remake of "Bedazzled"
Re-teamed with Robert De Niro and Billy Crystal to direct the sequel "Analyze That"
Had a small role as Stanford University's Dean of Admissions in "Orange County"
Directed John Cusack in the comedy "The Ice Harvest"
Helmed several episodes of the NBC comedy "The Office"
Produced Jeff Garlin's independent film "I Want Someone to Eat Cheese With"
Played Seth Rogen's dad in the Judd Apatow comedy "Knocked Up"
Wrote, produced and directed the biblical comedy "Year One"; also played Adam, the first male