Sheri Turrell (Author) Sheri Turrell is a clinical psychologist and psychoanalyst and an ACBS Peer Reviewed ACT Trainer. She is Adjunct Lecturer in the University of Toronto's Department of Psychiatry and the creator of the online self-help program for teens, Choose Your Life . She has been working with teens for over 20 years and is based in Toronto, ON, Canada. Mary Bell (Author) Mary Bell is a social worker in private practice and clinical roles in Singapore and Toronto, ON, Canada. She specializes in helping youths and their parents through the adolescent transition. Her clinical affiliations have included The Hospital for Sick Children (SickKids), The Centre for Addiction and Mental Health (CAMH), and Trillium Health Partners.