This biography dates from 2006. 

Thomas Clark obtained degrees in geology from the University of Toronto (B.Sc., M.Sc.) and Queen's University, Kingston, Ontario (Ph.D.). He is currently a metallogenist for the Ministère des Ressources naturelles et de la Faune du Québec.For many years, he was responsible for mapping and mineral deposit studies in the Labrador Trough. Since the early 1990s, he has been studying mineral deposits in the North Shore area of the Grenville Province and he participated in a regional geological and mineral deposit synthesis in the area between Sept-Îles and Natashquan. He was involved in the discovery and study of the Lac Volant Ni-Cu deposit in 1996. 

Thomas has authored or co-authored more than 50 government reports and several scientific articles on the geology and mineral deposits of the Grenville Province, the Labrador Trough, and elsewhere in northern Québec. In 2004, he published, with co-author Robert Wares, a lithotectonic and metallogenic synthesis of the Labrador Trough. He has also co-edited two volumes on Grenville geology and mineral deposits. He has received several promotional awards from his employer and, in 1997, was co-recipient of the Jean Descarreaux Prize of the Québec Prospectors Association. In 2005-2006, he was selected as a Distinguished Lecturer by CIM. He is an adjunct professor at Laval University and a member of CIM, the Ordre des Géologues du Québec, the Geological Association of Canada, and the Mineralogical Association of Canada.