Claim: Uwe Jannsen is a German mathmatician who became a professor in 1991 and studied at the University of Hamburg in 1978 before moving on to a postdoc at Harvard during 1983 to 1984.
Evidence: Uwe Jannsen (born 11 March 1954, Meddewade) is a German mathematician, specializing in algebra, algebraic number theory, and algebraic geometry. In 1991 he became a full professor at the University of Cologne and since 1999 he has been a professor at the University of Regensburg. Jannsen studied mathematics and physics at the University of Hamburg with Diplom in mathematics in 1978 and with Promotion (PhD) in 1980 under Helmut Brückner and Jürgen Neukirch with thesis Über Galoisgruppen lokaler Körper (On Galois groups of local fields). In the academic year 1983–1984 he was a postdoc at Harvard University.