Hans Duistermaat

Johannes Jisse (Hans) Duistermaat was a Dutch mathematician. He studied mathematics at Utrecht University from 1959 to 1965 and obtained his PhD degree there in 1968 under the supervision of Hans Freudenthal. After a postdoctoral year 1969–70 in Lund, where he learned Fourier integral operators from Lars Hörmander, he went in 1971–74 to Nijmegen, where he became full professor in 1972. In 1974 he returned to Utrecht on the chair of professor Freudenthal, where he stayed until his unexpected death in March 2010.