Though he spent a great deal of time preparing in depth for each class meeting, Jackson was unpopular as a teacher. His students called him "Tom Fool". He memorized his lectures and then recited them to the class; any student who came to ask for help was given the same explanation as before. And if a student asked for help a second time, Jackson viewed him as insubordinate and punished him. For his tests, Jackson typically had students simply recite memorized information that he had given them. The students mocked his apparently stern, religious nature and his eccentric traits. In 1856, a group of alumni attempted to have Jackson removed from his position.