John Mark Freeman (January 11, 1933 – January 3, 2014) was an American pediatric neurologist specializing in epilepsy.
He is known for bringing two long-abandoned treatments for pediatric epilepsy back into popular use.
One, the ketogenic diet, is a carefully managed, high-fat diet plan that reduces the incidence of seizures in children during and after its use, and the other, the hemispherectomy, is a drastic surgical procedure in which part or all of one highly seizure-prone hemisphere of the brain is removed to alleviate severe epilepsy.