Officer of the Order of Canada

• Awarded on: April 6, 2006
• Invested on: December 15, 2006

William Marshall is an international authority on the assessment and treatment of sexual offenders. Correctional institutions throughout North America, Europe and Australasia have modelled their programs based on his research and advice. A professor emeritus of psychology and psychiatry at Queen's University and the director of Rockwood Psychological Services, he has also headed sex offender programs at a number of correctional institutions since the 1970s. His groundbreaking research has helped criminal justice systems throughout the world to develop more effective therapeutic programs.