Harry Govier Seeley (18 February 1839 – 8 January 1909) was a British paleontologist and professor of geology and mineralogy at King’s College and Bedford College as well as a lecturer on geology and physiology at Dulwich College. He was the first to divide dinosaurs into two groups, the Saurischians and Ornithischians, based on their pelvic bones and joints.
The postal card is from Seeley, California (02/15/84) at the domestic postcard rate of 13¢, to Army Post Office, New York 09333, Coleman Barracks, Mannheim, Germany.
Seeley authored the 1901 book Dragons of the Air, an Account of Extinct Flying Reptiles (this link is a free Kindle version) and believed that birds and pterosaurs were related, disputing Sir Richard Owen’s description of pterosaurs as cold-blooded. Seeley thought they must have been warm-blooded animals.