Ken Ribet

Ken Ribet
Kenneth A. Ribet in 2013
Born	(1948-06-28) June 28, 1948 (age 76)
Nationality	American
Alma mater	Brown University (BA, MA) Harvard University (PhD)
Known for	Ribet's lemma Ribet's theorem Herbrand–Ribet theorem
Awards	Fermat Prize (1989) Fellow of the American Academy of Arts and Sciences (1997) Fellow of the National Academy of Sciences (2000) Fellow of the American Mathematical Society (2012) Brouwer Medal (2017)
Scientific career
Fields	Mathematics
Institutions	Princeton University University of California, Berkeley
Thesis	Galois action on division points of abelian varieties with real multiplications  (1973)
Doctoral advisor	John Tate
Doctoral students	Frank Calegari Samit Dasgupta Bjorn Poonen

Kenneth Alan Ribet (/ˈrɪbɪt/; born June 28, 1948) is an American mathematician working in algebraic number theory and algebraic geometry. He is known for the Herbrand–Ribet theorem and Ribet's theorem, which were key ingredients in the proof of Fermat's Last Theorem, as well as for his service as President of the American Mathematical Society from 2017 to 2019. He is currently a professor of mathematics at the University of California, Berkeley.