
What's a world-renowned entomologist
with a DOCTORATE...
The Big Bang Theory Season 3, Episode 2

Your DOCTORATE is in neurobiology.
I fail to see the distinction.
The Big Bang Theory Season 4, Episode 24

I have a DOCTORATE in astrophysics
and I'm every bit as awesome
The Big Bang Theory Season 10, Episode 11

I went to school for half my life.
I have a DOCTORATE.
The Big Bang Theory Season 8, Episode 20

Is it any wonder
he doesn't have a DOCTORATE?
The Big Bang Theory Season 4, Episode 18