After graduating from Harvard, Kaczynski attended the University of Michigan, specializing in mathematics, publishing frequently in scholarly journals. In 1967, he began teaching mathematics at the University of California at Berkeley. He resigned from Berkeley in 1969.
According to Harvard's alumni records office, Kaczynski lived in Iowa and Montana during the period 1970-1977; in 1977, he listed his address as "788 Banchat Tesh, Khadar Khel, Afghanistan." Harvard lost track of him after that. According to some news reports, he also lived for a time in Salt Lake City, Utah.
In the late 1970s, he moved to the Scapegoat Wilderness area, near Lincoln, Montana, a small town on the Blackfoot River. According to property records, he bought 1.4 acres in the region in 1971, and owns the property along with his brother.
Locals in Lincoln said he bought a number of history books, but otherwise don't have much to say about him. He checked out literature in several languages from the local library. In February of 1996, shortly before federal officials arrested him, he applied for a job at a general store in Lincoln. Kaczynski's home in Lincoln was a one-room, 10x12 foot shack.
On July 7, 1978, Kaczynski applied for an Illinois driver's license, and listed his address as his parents' home in Lombard, Illinois. That license expired in 1982. He obtained a Montana state identification card in 1983, and a driver's license in 1986. His driver's license expired in April 1996, while he was in federal custody.