This article chronicles the life and work of paleontologist Barnum Brown, best known for his discovery of Tyrannasaurus Rex. Brown was so prolific in his work, that there are boxes in the American Museum of Natural History's storerooms that have yet to be unpacked. Brown's travels and expeditions served him well as an informer to the Office of Strategic Services, as well as a prospector for oil companies, who helped fund his expeditions. Details of Brown's career and findings are provided.