Harold Allen Ramis (born November 21, 1944) is an American actor, director, and writer, specializing in comedy. His best known film acting roles are as "Egon Spengler" in Ghostbusters (1984) and "Russell Ziskey" in Stripes (1981); Ramis also co-wrote both films. As a writer/director, his films include Caddyshack (1980), Groundhog Day (1993), and Analyze This (1999). Ramis is also noted as the original head writer of the TV series SCTV (in which he played Moe Green), and as one of three writers to pen the screenplay for the film National Lampoon's Animal House (1978). Most recently, he had small roles in the films Knocked Up (2007) and Walk Hard (2007), and has directed episodes of the US TV series "The Office"