Dr. Harris conducts parenting capacity and other court-ordered assessments and has provided expert testimony on Family Court matters over the years. Dr. Harris is one of the founding members of the London Region Fetal Alcohol Spectrum Disorder (FASD) Service and continues to support that initiative as a member of the diagnostic team and through her supervision of the service coordinator. Dr. Harris is a consulting psychologist for a residential program for adolescents, providing youth assessments, group programming as well as consultation and training to program staff. Dr. Harris also engages in teaching, training, and program development in applied behavior analysis and cognitive behavior therapy.

As adjunct faculty at Western University in the Counselling Psychology Program and at Brock University in the Applied Disability Program, Dr. Harris supervises student placements and research, and teaches courses in applied behaviour analysis. Dr. Harris has co-authored papers in several scholarly journals including Behavior Therapy, Journal of Autism and Developmental Disorders, Journal on Developmental Disabilities, and a chapter in the book entitled Juvenile Justice: Advancing Research, Policy, and Practice.