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Not who you're looking for? Others named John Macdonald: Scottish footballer (born 1961) · journalist and politician, Senator for Queensland, Australia · Canadian football player · American football coach
John Marshall Macdonald (9 November 1920 – 16 December 2007) was a forensic psychiatrist most renowned for his theory of the Macdonald triad of sociopathic traits and his profiling of serial killers. He published approximately a dozen books in his field.
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