Ramis leaves behind a formidable body of work, with writing credits on such enduring comedies as “National Lampoon’s Animal House” (which upon its 1978 release catapulted the film career of John Belushi, with whom Ramis acted at Second City), “Stripes” (1981) and “Ghostbusters” (in which Ramis also co-starred) plus such directing efforts as “Caddyshack” (1980), “National Lampoon’s Vacation” (1983), “Groundhog Day” and “Analyze This.”