An American actor, comedian, and writer, he gained fame in the 1980s with roles in films like "Diner" and "Aliens." Known for his quick wit and relatable humor, he co-created and starred in the hit TV sitcom "Mad About You," earning multiple Emmy and Golden Globe nominations. Beyond acting, he has authored several books and continued appearing in various film and TV projects, including roles in "Stranger Things" and "The Kominsky Method," showcasing his versatile talent in both comedy and drama.