Scott Cherba is a geologist, educator, scientific illustrator, and large format photographer based in Tucson. He specializes in the geology and natural history of southwest North America from the Colorado Plateau to the Gulf of California. His clients include non-profit organizations, universities, government agencies, NGOs, and museums worldwide. He spent several seasons as a geoscientist and park ranger talking about rocks and stars on Grand Canyon's North Rim. Visit him online at cherba.com.