Harold Allen Ramis was an American actor, director, writer, and comedian. His best-known film acting roles were as Egon Spengler in Ghostbusters and Ghostbusters II and Russell Ziskey in Stripes; he also co-wrote those films. As a writer-director, his films include the comedies Caddyshack, National Lampoon's Vacation, Groundhog Day, and Analyze This. Ramis was the original head writer of the television series SCTV, on which he also performed, and he was one of three screenwriters of the film National Lampoon's Animal House. Ramis' films influenced subsequent generations of comedians and comedy writers. Filmmakers including Jay Roach, Jake Kasdan, Adam Sandler, and Peter and Bobby Farrelly have cited his films as among their favorites. He won the BAFTA Award for Best Original Screenplay for Groundhog Day.

https://en.wikipedia.org/wiki/Harold_Ramis