Physician, writer and full-time advocate, David Wallinga, M.D., represents the Institute for Agriculture and Trade Policy (IATP) as a de facto doctor to the nation's ailing food system. Through his work, Dr. Wallinga sheds a spotlight—and a public health lens—on the less savory side of the food system, like mercury in high fructose corn syrup, or arsenic being fed to chickens and turkeys. His 2010 essay on farm policy and the obesity epidemic in Health Affairs helped launch unprecedented interest in the health of the 2012 Farm Bill; subsequently, dozens of the nation's medical and public luminaries have signed onto IATP's Charter for a Healthy Farm Bill. Dr. Wallinga has also served as the only physician on the steering committee of Keep Antibiotics Working: The Campaign to End Antibiotic Overuse since 2000.