since 1.8.2026: Bielefeld University, W3 Professor
2004–2026: Swansea University (UK), Lecturer, Senior Lecturer, Reader, Professor (from 2011)
2021–2024: European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*, Trento, IT), Director
2001–2004: Ohio State University (USA), postdoc
1999–2001: Heidelberg University (DE), postdoc
1990–1999: Utrecht University (NL), UG and PhD student