
So now let's bring out THEORETICAL physicist,
Dr. Sheldon Cooper!
The Big Bang Theory Season 6, Episode 18

Theoretical physicists do not get canned.
The Big Bang Theory Season 1, Episode 4

Senior THEORETICAL particle physicist
at CaITech, focusing on M Theory.
The Big Bang Theory Season 3, Episode 14

as a THEORETICAL
physicist,
The Big Bang Theory Season 7, Episode 20

No, he's a THEORETICAL physicist
at CalTech.
The Big Bang Theory Season 9, Episode 8