From Wikipedia:
He had no talent for teaching. He was dismissed by [Johns Hopkins University] after one semester. . . . On leaving JHU, he took a position . . . at Brown University in Providence, Rhode Island, where it became clear that he was no better at teaching advanced students than freshmen. . . . He was let go by Brown, being hired after a trip to Europe by Yale University . . . He quickly showed at Yale the same traits he had at JHU and Brown: he . . . was incapable of giving a lecture at a level that a student (even a graduate student) could comprehend. He was also unable to direct the research of graduate students . . . At age 70, [he] was involuntarily retired.
Which makes me want to learn more about the physical chemist Lars Onsager, who won a Nobel Prize in 1968.