Dennis Davidson was born in Novato, CA. He began his career in space art at the 1984 NASA Summer Study at the California Space Institute, and later became art director for CalSpace.
Holding a degree in Biology from the University of California, he came to space art from medical illustration, which parallels space art in its efforts at realism and scientific accuracy. His subject interest ranges from astronomy to molecular biology and he describes his work as "planetary environmentalism". His commercial work has been published in Air & Space, Contact, Discover, Popular Science, and Spaceflight magazines as well as books for Bantam, Random House, Silver-Burdett, Scholastic, Ellis Horwood, TOR, and Troll Associates.