Rolf Ludvigsen was Professor of Geology at the University of Toronto for 13 years before resigning to move to the west coast. He is Head of the Denman Institute for Research on Trilobites (better known as DIRT) and works as a consulting paleontologist. He was the recipient of the Past President's Medal from the Geological Association of Canada and the founding chair of the British Columbia Paleontological Alliance. He has written 50 refereed papers and monographs, chiefly on trilobites. He is the author of "West Coast Fossils: A Guide to the Ancient Life of Vancouver Island" (Harbour, 1998) and the editor of "Life in Stone: A Natural History of British Columbia's Fossils" (UBC Press, 1996).

E-mail: rolfl@telus.net

Brian Chatterton has been Professor of Geology at University of Alberta for 30 years; ten years as chair or associate chair of the department. He was executive director of the Canadian Geoscience Council for five years. Currently, he is associate editor of Canadian Journal of Earth Sciences. He is the recipient of the D.A. Brown Medal from the Australian National University. He is the author of more than 100 refereed papers and monographs, chiefly on trilobites, and has three citations for best paper award in Journal of Paleontology.

E-mail: Brian.Chatterton@ualberta.ca