1. Chairperson and professor of geology and marine geology at the University of Delaware, Newark 19711
2. Assistant professor of anthropology and archaeology and dean of the College of Letters and Science at the University of Minnesota, Duluth 55812, Associated with the Archaeometry Laboratory of the University of Minnesota, Duluth
3. Professor of geology and archaeology and dean of the College of Letters and Science at the University of Minnesota, Duluth 55812, Associated with the Archaeometry Laboratory of the University of Minnesota, Duluth