In 1985–1987 Gepner was a
postdoctoral researcher at
Princeton University. He made important contributions to the study of
Rational Conformal Field Theory with extended
chiral algebras. He also pioneered the use of methods of conformal field theory to study compactifications of
superstring and
heterotic string on
Calabi–Yau manifolds. He introduced exactly solvable examples of such compactifications now known as Gepner models. This was an important step in establishing that superstrings and heterotic strings have a
landscape of consistent vacua. Later he held research and teaching positions at Princeton University (1987-1989), Weizmann Institute (1989-1993) and
California Institute of Technology (1992-1994). Since 1993 he has been an associate professor at the Weizmann Institute. Gepner's later work centered on Rational Conformal Field Theory and its relation with 2D integrable models. Gepner also made notable contributions to the theory of partitions in number theory, finding deep generalizations and analogs of the
Rogers–Ramanujan identities. ==Students==