
Here he comes, Professor Proton
The Big Bang Theory Season 6, Episode 22

Hey, Professor Proton.
The Big Bang Theory Season 11, Episode 15

this Professor Proton thing
pretty hard.
The Big Bang Theory Season 7, Episode 22

SHELDON:
Nice to meet you, Professor Proton.
The Big Bang Theory Season 6, Episode 22

next to Professor Proton,
I would not have believed you.
The Big Bang Theory Season 7, Episode 7