Research Areas: Simulations of Lattice Field Theories with and without dynamical fermions, Nonperturbative Aspects of (supersymmetric) Field Theories, Monopoles, Sphalerons and Instantons in Gauge Theories, Quantum Physics in Curved Spaces: Black Hole Physics, Conformal Field Theories: Kac-Moody and W-Algebras, WZW-Models, Toda Theories, Quantization of 2-dimensional Gauge Theories and External Field Problems: Effective Action, Effective Potentials, Casimir Effect, Anomalies.