Bob Newhart is a noted comedian who won an Emmy for his performance on The Big Bang Theory as Arthur Jefferies, also known as Professor Proton. Bob started out in stand up comedy in the 1950s and went on to television and movies. He is best known for his television series, The Bob Newhart Show and Newhart. He also appeared in the movies Catch-22, Cold Turkey, The Rescuers, First Family, Legally Blonde 2 and Elf. He appeared on five episodes of The Big Bang Theory.