William Lagrand Chesser (1940 - present) is a geologist, scientific illustrator, and artist who primarily worked as an exploration geologist in the oil industry in Colorado and Texas. Born in Pensacola, Florida, he served in the U.S. Air Force and then earned a bachelor's and master's in geology at Brigham Young University. In addition to his work as a geologist, Chesser illustrated science textbooks, a series of works about the Grand Canyon, and a large 'Physiographic map of the Earth,' published in several editions in the 1970s and 1980s.