Thewissen, J. G. M.

J. G. M. Thewissen, Professor of Anatomy at Northeastern Ohio Universities College of Medicine, is editor of "The Emergence of Whales: Evolutionary Patterns in the Origin of Whales "and coeditor, with William F. Perrin and B. Wursig, of "The Encyclopedia of Marine Mammals." Sirpa Nummela is Academy Research Fellow at the University of Helsinki in Finland.