John Freeman, MD, developed the ketogenic diet while working at Johns Hopkins University. The pediatric epilepsy center at Johns Hopkins was renamed The Johns Hopkins John M. Freeman Pediatric Epilepsy Center in his honor in 2002. The diet and the center were featured on Dateline in a 1994 edition as a therapy for childhood seizure disorders. "Dateline" reported that miraculous results were obtained in a large percentage of the patients who were placed on the high fat diet.

A prolific author, he has written nearly 150 articles, 41 book chapters and seven books or editions of books including, the award winning The Ketogenic Diet: A Treatment for Children and Others with Epilepsy.