Robin Williams was born in Chicago, Illinois (July 21, 1951 - August 11th, 2014) and was an actor and comedian. He rose to fame as the alien Mork in Mork & Mindy opposite Pam Dawber. He established a career in stand-up comedy and feature film acting. Robin starred in many films including Good Morning Vietnam, Hook and Mrs Doubtfire. Sadly Robin committed suicide in his home in California following a diagnosis of Parkinson's.
Robin Williams made a cameo appearance as Tomas at the start of The One With The Ultimate Fighting Champion along with his co-star Billy Crystal as Tim. Apparently all their lines were ad libbed on the spot.