[3][4] Gebhard was also known for his archaeological work recording and documenting the multiple styles of pictographs in the Lower Pecos Canyonlands on the border of Texas and Mexico.
While finishing his doctorate, he served, for six years, as director of the Roswell Museum and Art Center in New Mexico, before moving to UC Santa Barbara in 1961.
Davis, and Edward B. Jelks were hired to lead an archaeological survey in the Lower Pecos Canyonlands of Texas and Mexico prior to the construction of Lake Amistad.
The National Park Service funded the Diablo Reservoir Rock Art Survey in which the crew documented over 200 archaeological sites.
"[8][9] Gebhard was also active in service to his community, serving for many years on the Santa Barbara County Architectural Board of Review.