A PowerPoint presentation
by Sheldon Cooper, PhD."
The Big Bang Theory Season 3, Episode 15
If you could run out and get a PhD,
that might make her like you.
The Big Bang Theory Season 8, Episode 23
and where Leonard got his PhD,
so it may have gone downhill.
The Big Bang Theory Season 10, Episode 24
and where Leonard got his PhD,
so it may have gone downhill.
The Big Bang Theory Season 10, Episode 23
I'm getting my PhD.
The Big Bang Theory Season 4, Episode 24