Director of the Physics of Nanoscale Systems division ER-C-1 of the Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons (ER-C) and Director of the u0022Institute for Microstructure Research division PGI-5 of the Peter Grünberg Institute at Forschungszentrum Jülich GmbH.

Director of the Quantum Theory of Materials division PGI-1 of the Peter Grünberg Institute and Managing Director of the Institute for Advanced Simulation (IAS-1) at Forschungszentrum Jülich GmbH.

Adjunct Professor at the Center for Quantum Spintronics, Norwegian University of Science and Technology NTNU, Trondheim, Norway and Professor at the Johannes Gutenberg-Universität Mainz.

Professor of experimental physics, elected member of the Royal Dutch Academy
of Arts and Sciences (KNAW) and the Academia Europaea. 

Scientific Staff at University of Hamburg, Faculty of Mathematics, Informatics and Natural Sciences, Institute for Nanostructure and Solid State Physics, Surface and Interface Science

Scientific Staff at Forschungszentrum Jülich, Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons, Physics of Nanoscale Systems division, Working Group Electromagnetic Field Mapping

Scientific Staff at Forschungszentrum Jülich, Peter Grünberg Institute and Institute for Advanced Simulation, Quantum Theory of Materials Division, Classical spin dynamics and Monte Carlo Simulation

Assistant Professor at Radboud University, Institute for Molecules and Materials, Ultrafast Spectroscopy of Correlated Materials