Siebert studied mathematics starting 1984 at the University of Erlangen. In 1986, he changed to the University of Bonn and in 1987 to the University of Göttingen where he finished his Diplom in 1989 under the supervision of Hans Grauert with distinction. He became Grauert's PhD student and assistant in Göttingen. He received his PhD in 1992 (Faserzykelräume, geometrische Plattifikation und meromorphe Äquivalenzrelationen). A stay at the Courant Institute followed in 1993–94 after which we went to Bochum. In 1997–98 he spent some time at the MIT as a visiting scholar before completing his habilitation in Bochum in 1998 (Gromov–Witten invariants for general symplectic manifolds). As a DFG-Heisenberg Fellow, he went to the Universität Paris VI/Universität Paris VII from 2000 to 2002. From there, he was called to a professorship at the Albert-Ludwigs-Universität Freiburg in 2002. He moved on to the Universität Hamburg in 2008, and in 2011, he became the head of the Graduiertenkolleg Mathematics Inspired by String Theory and QFT. In 2018, Siebert joined the faculty of the University of Texas at Austin as a professor of mathematics[1] and holds the Sid W. Richardson Foundation Regents Chair in Mathematics #4.[2]
