
I've been thinking about getting my DOCTORATE,
and he wants to teach. Why not?
The Big Bang Theory Season 8, Episode 2

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

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

get a DOCTORATE.
The Big Bang Theory Season 5, Episode 21

You've heard him tease me
about not having a DOCTORATE.
The Big Bang Theory Season 5, Episode 21