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

Curator Emeritus, National Museum of Natural History, Smithsonian Institution

Professor and Curator of Mammals Emeritus, University of California, Berkeley

Curator Emeritus of Mammals, Field Museum of Natural History

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

Smithsonian Institution

Chief Scientist, Australian Museum

Muséum National d'Histoire Naturelle

Curator, American Museum of Natural History

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