
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

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

Of course not.
I'm a THEORETICAL physicist.
The Big Bang Theory Season 2, Episode 23

I am a published THEORETICAL physicist
with two doctorates...
The Big Bang Theory Season 2, Episode 2