Curator Emeritus, National Museum of Natural History, Smithsonian Institution

Professor of Biology, City College of the City University of New York

Research Associate, Dept. Vertebrate Zoology, Smithsonian Institution, Nat. Mus. Nat. Hist.

Smithsonian Institution

Muséum National d'Histoire Naturelle

Curator, American Museum of Natural History

Professor of Biology, University of New Mexico

Professor, University of Adelaide

Professor of Wildlife Sciences, Leibniz Institute for Zoo & Wildlife Research

Curator of Mammalogy, American Museum of Natural History