J. Frank Dobie (1888–1964) was born in Texas, where he taught at the University of Texas. Among his many books are The Mustangs (available in a Bison Books edition) and The Longhorns. Robert Crabtree is the founder of the Yellowstone Ecological Research Center. Jennifer Sheldon is a canid biologist and author of Wild Dogs: Natural History of Non-Domestic Canidae.