Mental illness researcher who turned the subject into a hard science by applying biology.
By looking at physiological changes that accompany disease, he was able to shed new light on how the brain and body function.
In his work on schizophrenia, he discovered that it runs in the family and is not simply caused by bad parenting.
He had two children with his wife of 60 years, Dr. Josephine Gross Kety.
He adopted psychology from Sigmund Freud's roots to form a scientific field that could be monitored and tested.