Kaczynski as an assistant professor at UC Berkeley in 1968
In 1962, Kaczynski enrolled at the University of Michigan, where he earned his master's and doctoral degrees in mathematics in 1964 and 1967, respectively. Michigan was not his first choice for postgraduate education; he had applied to the University of California, Berkeley, and the University of Chicago, both of which accepted him but offered him no teaching position or financial aid. Michigan offered him an annual grant of $2,310 (equivalent to $22,348 in 2022) and a teaching post.[20]
At Michigan, Kaczynski specialized in complex analysis, specifically geometric function theory. Professor Peter Duren said of Kaczynski, "He was an unusual person. He was not like the other graduate students. He was much more focused about his work. He had a drive to discover mathematical truth." George Piranian, another of his Michigan mathematics professors, said, "It is not enough to say he was smart."[31] Professor Allen Shields wrote about Kaczynski in a grade evaluation that he was the "best man I have seen."[32] Kaczynski received 1 F, 5 Bs and 12 As in his 18 courses at the university. In 2006, he said he had unpleasant memories of Michigan and felt the university had low standards for grading, as evidenced by his relatively high grades.[20]
For a period of several weeks in 1966, Kaczynski experienced intense sexual fantasies of being female and decided to undergo gender transition. He arranged to meet with a psychiatrist, but changed his mind in the waiting room and did not disclose his reason for making the appointment. Afterwards, enraged, he considered killing the psychiatrist and other people whom he hated. Kaczynski described this episode as a "major turning point" in his life:[33][34][35] "I felt disgusted about what my uncontrolled sexual cravings had almost led me to do. And I felt humiliated, and I violently hated the psychiatrist. Just then there came a major turning point in my life. Like a Phoenix, I burst from the ashes of my despair to a glorious new hope."[34]
In 1967, Kaczynski's dissertation Boundary Functions[36] won the Sumner B. Myers Prize for Michigan's best mathematics dissertation of the year.[9] Allen Shields, his doctoral advisor, called it "the best I have ever directed,"[20] and Maxwell Reade, a member of his dissertation committee, said, "I would guess that maybe 10 or 12 men in the country understood or appreciated it."[9][31]
In late 1967, the 25-year-old Kaczynski became an acting assistant professor at the University of California, Berkeley, where he taught mathematics. By September 1968, Kaczynski was appointed as an assistant professor, a sign that he was on track for tenure.[9] His teaching evaluations suggest he was not well-liked by his students: he seemed uncomfortable teaching, taught straight from the textbook and refused to answer questions.[9] Without any explanation, Kaczynski resigned on June 30, 1969.[36] In a 1970 letter written by the chairman of the mathematics department, John W. Addison Jr., to Kaczynski's doctoral advisor Shields, Addison referred to the resignation as "quite out of the blue,"[37][38] and, markedly, added that "Kaczynski seemed almost pathologically shy," and that as far as he knew Kaczynski made no close friends in the department, furthermore noting that efforts to bring him more into the 'swing of things' had failed.[39][40]