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About: John P. Gray (psychiatrist)     Goto   Sponge   NotDistinct   Permalink

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John Perdue Gray (August 6, 1825, Halfmoon Township (Pennsylvania) - November 29, 1886, Utica, New York) was an American psychiatrist at the forefront of biological psychiatric theory during the 19th century. He was an psychiatric expert in the trial for the assassination of president James A. Garfield Gray believed that insanity was always due to physical causes and that the mentally ill should be treated as physically ill. He explained that mental illness can be affected by physical factors relating to an individual. He studied three such factors, namely: diet, temperature and ventilation.