John P. Gray (psychiatrist)

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 attended Dickinson College, then the University of Pennsylvania School of Medicine, where he received his medical diploma in 1848., 19th-Century Psychiatrists of Note, www.nlm.nih.gov He spent on year of further studies in Europe, then is a resident at Blockley Asylum in Philadelphia. In 1850, Gray works in Utica Psychiatric Center in New York and superintendent in 1854, until his death in 1886. He was also the editor of the American Journal of Insanity, the precursor to the American Journal of Psychiatry.

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.

Works
Gray, John P. General Paresis, or Incomplete Progressive Paralysis. Albany, NY: Van Benthuysen, 1866.

Gray, John P. Insanity, its Dependence on Physical Disease. Utica, NY: Roberts, 1871. https://archive.org/details/insanityitsdepen00gray

Gray, John P. Insanity: its Frequency and Some of its Preventable Causes. Utica, NY, 1886.

Gray, John P. ''The United States vs. Charles J. Guiteau, Indicted for Murder of James A. Garfield, Twentieth President of the United States. Opinion of ... on the Sanity of the Prisoner''. Washington, 1882.