About Us: Evelyn & Bob

Evelyn Billo

Robert Mark, Ph.D.

Loves the out-of-doors, hiking, animals, books, flowers, and her family. Has been combining her loves for over 30 years through photography and searching out petroglyphs and pictographs in out-of-the-way places.


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Physics, photography, rock art, computers, and conservation combine as favorite interests in this bookaholic vegetarian scientist. Bob was transferred from northern California to Flagstaff, Arizona a few years ago. He is retired from the USGS, and loves living among the canyons of the Colorado Plateau.


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RCS: Computer science in the service of rock art research, protection, and education.