
William Mills Irwin (born April 11, 1950) is an American actor, choreographer, clown, and comedian. He began as a vaudeville-style stage performer and has been noted for his contribution to the renaissance of the American circus during the 1970s. He has made several appearances on film and television. He won a for his role in Who's Afraid of Virginia Woolf? He also worked as a choreographer on Broadway. He was nominated for the Tony Award for Best Choreography in 1989 for Largely New York. He is also known as Mr. Noodle on the Sesame Street segment Elmo's World, and he appeared in the Sesame Street film short Does Air Move Things? He has regularly appeared as Dr. Peter Lindstrom on Law & Order: Special Victims Unit and had a recurring role as "The Dick & Jane Killer" on CSI: Crime Scene Investigation. From 2017 to 2019, he appeared as Cary Loudermilk on the FX television series Legion.
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The Odyssey
2026 · as Polyphemus (voice)

Interstellar
2014 · as TARS (voice)

How the Grinch Stole Christmas
2000 · as Lou Lou Who

Hot Shots!
1991 · as Buzz Harley

Popeye
1980 · as Ham Gravy

Sister Act 2: Back in the Habit
1993 · as Unnamed Brother #1

Rachel Getting Married
2008 · as Paul Buchman

A Midsummer Night's Dream
1999 · as Tom Snout

The Manchurian Candidate
2004 · as Scoutmaster

Lady in the Water
2006 · as Mr. Leeds

Across the Universe
2007 · as Uncle Teddy

Spoiler Alert
2022 · as Bob

Eight Men Out
1988 · as Eddie Collins

My Blue Heaven
1990 · as Kirby

Rustin
2023 · as A. J. Muste

Irresistible
2020 · as Elton Chambers

Lust Life Love
2021 · as Richard

Higher Ground
2011 · as Pastor Bud