https://www.phillymag.com/news/2019/09/14/donald-trump-at-wharton-university-of-pennsylvania/

It’s rare for a professor to disparage the intelligence of a student, but according to attorney Frank DiPrima, who was close friends with professor William T. Kelley for 47 years, the prof made an exception for Donald Trump, at least in private. “He must have told me that 100 times over the course of 30 years,” says DiPrima [...] “I remember the inflection of his voice when he said it: ‘Donald Trump was the dumbest goddamn student I ever had!’” He would say that [Trump] came to Wharton thinking he already knew everything, that he was arrogant and he wasn’t there to learn.” Kelley, who passed away in 2011 at age 94, taught marketing at Wharton for 31 years, retiring in 1982.