2021-present, Professor Emeritus, Laurentian University
1997-2021, Professor and Research Chair in Mineral Exploration, Laurentian University
2013-2018, Director, NSERC-CMIC Exploration Footprints Network
2010-2011, Director of Mining Initiatives, Laurentian University (founder of School of Mines)
2002-2003, Visiting Professor, Indiana University
1997-2004, Founding Director, Mineral Exploration Research Centre, Laurentian University (merc.laurentian.ca)
1990, Visiting Research Fellow, Research School of Earth Sciences, Australian National University
1989, 1991, Visiting Research Fellow, Max-Planck-Institut fur Chemie, Mainz
1984-1997, Asst/Assoc/Full Professor, University of Alabama
1983-1984, Post-Doctoral Fellow, University of Toronto
1976-1979, Mineralogist, Iron Ore Company of Canada
1975, Exploration Geologist, Iron Ore Company of Canada