Bradford D. Hollingsworth, Ph.D.

Curator of Herpetology  

Brad has served as the department’s curator since 2000, after serving as a postdoctoral fellow, guest curator of exhibits, expedition lead herpetologist, museum store employee, and volunteer. He received his doctorate from Loma Linda University and obtained both his M.S. and B.S. from San Diego State University. Brad’s research focuses on the evolution and biogeography of the herpetofauna of Baja California and its associated islands. Brad is also an Adjunct Professor at San Diego State University where he regularly teaches in the Biology Department.


Frank Santana, M.S.

Collections Manager, Herpetology

Frank grew up in San Diego and is interested in conservation, ecology, and taxonomy of reptiles and amphibians. He has field experience with conservation of amphibians native to southern California and Baja California. Since becoming the Collections Manager in 2019, he has contributed to expeditions and surveys along the Baja California peninsula, deserts of southern California, and throughout San Diego County. Frank is also involved in citizen science and education projects. His work is currently focused on the conservation ecology of the endangered California Red-legged Frog in southern California and Baja California. His favorite frog is the spadefoot, which can be coaxed by mother nature from their underground burrows to mate and forage on rainy and humid nights.

Research Associates

Charles Crumly, Ph.D. (University of California Press, Berkeley) 

Lee Grismer, Ph.D. (Professor of Biology, La Sierra University)

William Presch, Ph.D. (California Desert Studies Consortium, Department of Biological Sciences, CSU Fullerton)

Tod Reeder, Ph.D. (San Diego State University)


Departmental Associates

Mr. Clark Mahrdt (Southwest Biological Associates)

Mr. Dick Schwenkmeyer (Mesa Community College, Retired)

Angelo Soto-Centeno (Florida Museum of Natural History)

Dustin Wood (United States Geological Survey)



The normal day-to-day accomplishments of the department would not be feasible without our core group of volunteers. Volunteer projects include making fieldguide webpages, digital mapping, fieldwork, and collections renovation.

The department is currently not accepting new volunteers. 

Be sure to check out other volunteer opportunities on the  Current Needs page. We offer a wide range of activites for individuals interested in natural history.