Jonathan Reis­man M.D. is a doc­tor of inter­nal med­i­cine and pedi­atrics, as well as an author, nat­u­ral­ist, trav­el­er, and teacher of wilder­ness sur­vival and pre­his­toric crafts. He has prac­ticed med­i­cine in some of the world’s most remote places, includ­ing the Russ­ian and Alaskan Arc­tic, Antarc­ti­ca, at high-alti­tude in Nepal, rur­al Appalachia, the urban slums of Kolkata, India and among the Oglala Sioux in South Dako­ta. His writ­ing has appeared in The New York Times, The Wash­ing­ton Post, Slate and Dis­cov­er Mag­a­zine. He runs a non-prof­it to improve health­care and edu­ca­tion in India, and he lives in Philadel­phia with his wife and children.