Jonathan is an internist and pediatrician with experience in wilderness medicine and global health. He has worked in emergency rooms in Arctic Alaska, rural Appalachia, and a Native American reservation in South Dakota. His wilderness medicine experience includes work in a high-altitude clinic in the Nepali Himalaya and aboard expedition cruises to Antarctica and Wrangel Island in the Russian Arctic. Jonathan has conducted global health research on newborn mortality, malaria prevention in India's urban slums, and altitude sickness, and he serves as president of the 501c3 charity the World Health and Education Network (WHEN). He writes and lectures on the connections between nature and modern medicine, and is an avid forager of plants and mushrooms and an enthusiast of prehistoric crafts and wilderness survival.  

Born and raised in northern New Jersey, Jonathan studied mathematics and philosophy at New York University. After graduating he lived in Russia conducting sociological research on the international environmental movement and its impact on the Russian forestry industry. He also studied indigenous cultures of the Kamchatka Peninsula in the Russian Far East. Jonathan then attended Robert Wood Johnson Medical School in Camden, New Jersey. 

Jonathan and his wife Anna Wexler are avid travelers and writers.