Institute University California, Berkeley, 1963-1964. From assistant curator to curator Florida State Museum, Gainesville. From assistant professor to professor University Florida.
Consultant continental shelf United States Department Interior, Washington, 1980-1982.
Member American Geological Institute (board governors 1976-1979), International Quaternary Association (vice president since 1983), Society Vert. Paleontological (president, editor 1978-1984), Paleontological Society (associate editor Paleobiology 1977-1981), Society Study Evolution, American Society Mammalogists, American Quaternary Association (associate editor Quaternary Research since 1983), American Buckskin Horse Association.
1963 - 1964