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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), both of which he also co-wrote. As a writer/director, his films include the comedies "Caddyshack" (1980), "Groundhog Day" (1993), and "Analyze This" (1999). Ramis was the original head writer of the television series 'SCTV' (in which he also performed), and one of three screenwriters for the film "National Lampoon's Animal House" (1978).