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

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

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

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

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