<P> 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 four guest appearances on The Big Bang Theory as Professor Proton , for which he received his first Primetime Emmy Award on September 15 , 2013 . </P>
<P> 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 four guest appearances on The Big Bang Theory as Professor Proton , for which he received his first Primetime Emmy Award on September 15 , 2013 . </P>
who plays dr proton in big bang theory
who plays dr proton in big bang theory
Newhart
Newhart