| 2004 until present | Professor of English Linguistics |
| 2021 until present | a.r.t.e.s. Graduate School for the Humanities Cologne: Coordinator and mentor for graduate class 2 " Language, Discourse and Culture" (integrated track) with Prof. Dr. Nicolas Pethes |
| 2011 - 2017 | Director of the Language Laboratory of the School of Arts and Humanities |
| 2015 - 2017 | Member of the University Senate |
| 2012 - 2015 | Director of Cologne Center of Language Sciences (CCLS) |
| 2007 - 2011 | Dean of the Faculty of Arts and Humanities |
| 1999 - 2004 | Assistant Professor of English (tenure track), University of North Carolina at Charlotte |
| 1998 | Doctor of Philosophy (PhD), English Language and Linguistics, University of Wisconsin - Madison (awarded distinction) |