John Gordon Clark

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John 'Jack' Gordon Clark (1926–1999) was a Harvard psychiatrist known for his research on the alleged damaging effects of cults.^{[1][full citation needed]}

He was the target of harassment from the Church of Scientology after he testified against it to the Vermont legislature in 1976.^[2]

The Psychiatric Times, when naming him 1991 psychiatrist of the year, described him as "a quiet, courageous man of conviction, who was fighting an all-too-lonely and unappreciated battle against well-financed, ruthless organizations."

• Clark, John G. Cults. Journal of the American Medical Association. 242, 279–281. 1979
• Clark, John G.: On the further study of destructive cultism. In Halperin (ed.), 363–368