In 1977, he joined Chicago's Second City improv troupe and remained for three years. In 1979, Garry Marshall saw Jim performing for Second City and arranged for him to come to Hollywood and co-star in the TV pilot Who's Watching the Kids (1978) for Paramount and, then, for a role in the series Working Stiffs (1979) (co-starring Michael Keaton). Later, in 1983, he joined the cast of Saturday Night Live (1975) for two years. Jim came to national attention in About Last Night... (1986), playing the role he originated in the Chicago Apollo Theatre's production of David Mamet's Obie-award winning play "Sexual Perversity in Chicago". He resides in Los Angeles with his wife Jennifer Sloan, their daughter Jamison and a son, Robert Belushi, from Belushi's first marriage. Plus he is voiced in the actor of the Rugrats as "Santa Claus".