Isabel Shessel has worked in field of psychology for more than thirty years. She has worked with many individuals with and without disabilities. This includes people with learning disabilities and attention deficit disorder. She has published articles on the impact of living with learning disabilities. Her clients include children, adolescents, and adults. Often problems are educational in nature and appropriate accommodations must be developed for the individual to succeed in school. She has also worked with individuals who need some assistance in career exploration and career planning. She also provides counselling for people with stress, anxiety, and mild depression.

Isabel Shessel has been a volunteer with the Learning Disability Association both at the local community level and the provincial level. She is a past chairperson of the LDA Ontario. She also worked for many years with the College Committee on Disability Issues (CCDI) which is a provincial association of the community college system in Ontario. She represented Seneca College for a number of years and served a term as Chairperson of the provincial body. This organization worked with the Ministry of Training, Colleges, and Universities to ensure funding and appropriate accommodations for students at the postsecondary level.

Isabel Shessel has a graduate diploma in Assessment and Counselling, a Master's degree in Special Education, and a doctorate in Applied Psychology. She is a licensed member of the College of Psychologists of Ontario. She is a member of the Canadian Psychological Association and the American Psychological Association.