M.S. 1978: University of Delaware, College of Marine Studies.
Ph.D. 1982: University of Delaware, College of Marine Studies.
Research Professor, Department of Earth and Environmental Sciences, George Washington University, Washington, D.C. Adjunct Professor, Department of Biology, American University, Washington, DC
Adjunct Professor, Department of Geosciences, Florida Atlantic University, Boca Raton, Florida
Fellow, American Association for the Advancement of Science.
Editor Emeritus, The Nautilus.
Phylogeny, Biogeography, and Molecular Evolution of Gastropoda, with special interest in Pleurotomariidae, Cocculiniformia, Neogastropoda and land snails of the family Cerionidae. Origin, Evolution, and Biogeography of Deep-Sea Molluscan Faunas. Application of forensic techniques to resolve questions of organismal to evolutionary history within Mollusca.