Doctor of Medicine, Helsinki University, 1969. Division of Medical Sciences, University of Helsinki, 1974.
Resident in psychiatry Helsinki University Central Hospital, Helsinki, 1970—1975, head department forensic psychiatry, since 1975, associate professor and professor in psychiatry, 1992—1996, professor in forensic psychiatry, since 1996. Editor Acta Psychiatrica Scandinavica, Denmark, 1997—2003, Journal of Forensic Psychiatry, since 1991. Editorial advisor or referee for many international research journals.
Distinguished Service Medal IV text revision advisor American Psychological Association, 2000.
Member of New York Academy of Sciences.
Married Sirkku Vanamo Voutilainen, May 13, 1967. Children: Mikko Edvard Snellman, Antti Juhani Snellman, Milja Marjaana.