'beloved professor' is correct and usable in written English.
You might use it to describe an esteemed teacher, such as, "My beloved professor always had a way of making learning fun."
The beloved Professor of History taught at Iona College for 40 years.
He plays Giovanni, an engineer whose mother (Giulia Lazzarini), a beloved professor of Latin, is stricken with a fatal illness.
POLLITT--Daniel Hubbard, 88, Graham Kenan Professor of Law emeritus, UNC-Chapel Hill, a beloved professor of constitutional and labor law at UNC since 1957.
Because our beloved professor influenced me so much, I spent years trying to catch up with Schoenberg's atonal music.
A beloved Professor of English Literature at Fairleigh Dickinson University, Rutherford, NJ, Janice was a devoted teacher, and an inspiring role model.
It was Jacob Taubes, "my beloved professor of religion", who suggested Berman look at the recently translated economic and philosophic manuscripts of Marx.
Dartmouth College grappled today with grief and fear and uncertainty in the wake of the murder of two widely beloved professors, Half and Susanne Zantop, a German émigré couple found dead in their home on Saturday night.
The new details cast no light, however, on what could have connected the teenagers to the widely beloved professors, Half and Susanne Zantop, who were found stabbed to death on Jan . 27
"Or at least the most memorable; it's hard to compare your beloved college professor and your sixth-grade teacher.
Ted Lambros, an outsider like Segal, becomes the ultimate Harvard insider: a beloved classics professor, also like Segal.
The Brooklyn Law School community mourns the loss of our friend, Jean Leitner, wife of our beloved colleague, Professor Jerome Leitner.
