Book excerpt: Many, like Chrisman, have since become leaders in GIS-related education, research, and software engineering. Illustrated with numerous maps, drawings, diagrams, and photos, Charting the Unknown's twelve chapters are supplemented with a CD that contains three historic short films showing animated visualization. In addition, the CD contains videotaped interviews and a speech featuring some of the Lab's key figures, including Allan Schmidt, former executive director of the Lab; Eric Teicholz, founder and president of Graphic Systems; Jack Dangermond, founder and president of ESRI; Scott Morehouse, director of software development at ESRI; as well as the author.