Newhart later went into acting, starring as Chicago psychologist Dr. Robert Hartley in The Bob Newhart Show during the 1970s and then as Vermont innkeeper Dick Loudon on the 1980s series Newhart. He also had two short - lived sitcoms in the 1990s titled Bob and George and Leo. Newhart also appeared in film roles such as Major Major in Catch - 22 and Papa Elf in Elf. He provided the voice of Bernard in the Walt Disney animated films The Rescuers and The Rescuers Down Under. In 2004, he played the library head Judson in The Librarian, a character which continued in 2014 to the TV series The Librarians. In 2013, Newhart made his first of five guest appearances on The Big Bang Theory as Professor Proton, for which he received his first Primetime Emmy Award on September 15, 2013.
who plays professor proton on big bang theory
Bob Newhart