William Mills "Bill" Irwin (born April 11, 1950) is an American actor and clown who appeared in CSI: Crime Scene Investigation as profilic serial killer Nate Haskell.

He also portrayed as Lou Lou Who from the movie of Dr. Seuss' How the Grinch Stole Christmas in 2000.

Other Work[]

Bill is noted for starring in many award winning theatrical plays in Broadway. He is also noted for being a very successful clown in the circus during the 1970's and Bill also portrays the role of Mr Noodle, a popular character in the children's show, Sesame Street.