An American actor, comedian, and writer, he gained recognition for his quirky humor and offbeat performances. Rising to fame in the 1980s as a writer and performer on "Late Night with David Letterman," he became known for his unique comedic style. He transitioned to film and television, appearing in hits like "Groundhog Day" and the TV series "Get a Life" and "Schitt's Creek." His work earned him a cult following, celebrated for blending absurdity with charm.