Jonathan is an internist and pediatrician with an interest 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 an expedition cruise to Antarctica. 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. He lived in Russia for two years conducting sociological research on the international environmental movement and its impact on the Russian forestry industry since the fall of the Soviet Union. He also studied indigenous cultures of the Kamchatka Peninsula in the Russian Far East. Jonathan attended Robert Wood Johnson Medical School in Camden, New Jersey. During his medical education, he spent six months in India volunteering for medical and humanitarian charities in Mumbai and Kolkata. 

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