2014-2024 Director, Center for Sustainable Energy at Notre Dame
2009-2018    Director, Energy Frontier Research Center Materials Science of Actinides
2009-2024    Henry Massman Professor of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame
2002-2009       Chair of the Department of Civil Engineering and Geological Sciences, University of Notre Dame
2007-current   Concurrent Professor of Chemistry and Biochemistry, University of Notre Dame
2002-2009       Professor of Civil Engineering and Geological Sciences, University of Notre Dame
2002-current   Special Term Appointment, Chemistry Division, Argonne National Laboratory
2000-2002       Massman Associate Professor of Civil Engineering and Geological Sciences, University of Notre Dame
1999-2002       Director of Graduate Studies, Department of Civil Engineering and Geological Sciences, University of Notre Dame
1999-2002       Associate Professor of Civil Engineering and Geological Sciences, University of Notre Dame
1997-1999       Assistant Professor of Civil Engineering and Geological Sciences, University of Notre Dame 
1996-1997       Visiting Assistant Professor, Department of Geology, University of Illinois in Urbana-Champaign
1995-1996       NSERC Post-Doctoral Fellow, Department of Earth and Planetary Sciences, University of New Mexico
1994-1995       NSERC Post-Doctoral Fellow, Department of Earth Sciences, University of Cambridge
1994-1995       Research Fellow, Clare Hall College, University of Cambridge
1990-1994       Lecturer and Teaching Assistant, Department of Geological Sciences, University of Manitoba
1988-1989       Teaching Assistant, Department of Geology, University of Western Ontario
1986-1988       Teaching Assistant, Department of Geology, University of New Brunswick
1986               Research Assistant, Department of Geology, University of New Brunswick