
and where Leonard got his PhD,
so it may have gone downhill.
The Big Bang Theory Season 10, Episode 23

I have a PhD from Cornell University.
The Big Bang Theory Season 6, Episode 22

Sorry. I didn't get my PhD
in quitting.
The Big Bang Theory Season 11, Episode 15

I must say, Amy, I was very impressed
to see that Bernadette got her PhD.
The Big Bang Theory Season 4, Episode 24

I'm getting my PhD.
The Big Bang Theory Season 4, Episode 24