Tracy Jo Barker (née Miller) (born December 10, 1957) is an American herpetologist specializing in pythons. Barker grew up in Washington, D.C., as the daughter of who was Curator of ceramics and glass at the Smithsonian Institution. After an undergraduate degree in psychology at the University of Colorado, she graduated in biology at the Central Michigan University. She also worked as a reptile keeper at Buffalo Zoological Gardens. Already in her early years, she specialized in herpetology and focused on animal behavior. She worked as a field biologist for repopulating Green Iguanas in Panama and studied the reproductive behavior of Tuatara on Stephens Island in New Zealand.