We've lost contact with the Professor.
Money Heist Season 3, Episode 6
At that moment, the Professor realized
Money Heist Season 3, Episode 3
Yes. Sorry, tell me about Professor Proton.
The Big Bang Theory Season 6, Episode 22
in case at any point we lost
communication with the PROFESSOR."
Money Heist Season 1, Episode 6
Professor Rothman was forced
to step down.
The Big Bang Theory Season 5, Episode 17