Frans Oort

Frans Oort (born 17 July 1935) is a Dutch mathematician, specializing in algebraic geometry.
Biography.
Oort studied from 1952 to 1958 at Leiden University, where he graduated with a thesis on elliptic curves. He received his doctorate in 1961 in Leiden from and Jaap Murre with thesis "Reducible and Multiple Algebraic Curves", but had previously studied under Jean-Pierre Serre in Paris and Aldo Andreotti in Pisa. Oort was from 1961 at the University of Amsterdam, where he became a professor in 1967. In 1977, until his retirement in 2000, he was a professor at Utrecht University. He was a visiting scholar at several academic institutions, including Harvard University (1966/67) and Aarhus University (1972/73). In 2008 he was the Eilenberg Professor at Columbia University.
His research deals with, among other topics, abelian varieties and their modules. In 1994 he formulated what is now known as the André–Oort conjecture (generalizing a conjecture made in 1989 by Yves André). In 2000 Oort proved a conjecture made by Grothendieck in 1970. Oort was a co-author of an article on Poncelet's closure theorem and the author of "An aspect of harmony in music of Johann Sebastian Bach".
In 1962 Oort made a short contribution "Multiple algebraic curves" at the International Congress of Mathematicians in Stockholm, but was not an invited speaker. In 2011 he was elected a member of Academia Europaea. In July 2013 he gave a talk at the International Congress of Chinese Mathematicians in Tapei.
His doctoral students include Michiel Hazewinkel, Aise Johan de Jong, Hendrik Lenstra and Joseph Steenbrink.
He was married to (later divorced) author (1936-2020), who wrote "Afscheid van Joke Smit" (1987 biography of Joke Smit), "Doezamand: Roman" (1994 novel based upon her life as a student), and "Eerlijk gezegd: Interviews met vrouwen" (1974 collection of interviews with women); the couple have three grown sons, among whom is the Ultimate Frisbee player Jeroen Oort.