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

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

...I would've become a THEORETICAL physicist.
The Big Bang Theory Season 8, Episode 7

It's very impressive.
For THEORETICAL work.
The Big Bang Theory Season 4, Episode 3

Is it maybe because, like Sheldon's work,
your sex life is also THEORETICAL?
The Big Bang Theory Season 6, Episode 9