George Thomas Jefferson, museum assistant curator, prehistoric resources consultant. Care of Collections grantee, National Science Foundation, Washington, 1983-1985. Member American Quarternary Association, Paleontological Society, Society Vertebrate Paleontology (sustaining), Southern California Academy of Sciences (board governors since 1989), Pacific Mineralogical Society (honorary life member 1984), Sigma Xi.
Senior museum scientist University California, Riverside, 1964-1970. Curatorial assistant Los Angeles County Museum Natural History, Los Angeles, 1973-1980, assistant curator, since 1980, head, Rancho La Brea section, since 1982. Private practice consultant prehistory resources, since 1972.
Research associate appointee Earth Science and Anthropology, San Bernadino County Museum, since 1986. Charter chairman Mojave Desert Quaternary Research Center, since 1987.
- Manix Lake and the Manix fault: Field trip guide to selected geomorphic, stratigraphic, and structural features (Quarterly / San Bernardino County Museum Association)
1964 - 1970
1973 - 1980