Greg Lewis, Psy.D., 

Licensed Clinical Psychologist

Greg has been a clinical psychologist since 1987 and joined Alliance in 1994 after having worked at Cassens & Associates since 1987. His practice includes assessment and therapy with adolescents and adults as well as with couples and families. He is a Medicare provider and also provides assessment and treatment for older adults. Greg specializes in doing family-of-origin work and treats a range of disorders including depression, anxiety, substance abuse, conduct disorders, physical and sexual abuse, and personality disorders. His clinical interests include trauma, chronic medical illness, couples who are highly conflicted, life transition issues, and individuals experiencing spiritual struggles.

"In my work with clients, I try to create a safe place in which they feel listened to and can explore their current life difficulties. I help them to look at their problems in the context of their own personal history and family-of-origin, with the goal of helping them to have a better understanding of themselves and to make the changes necessary to move forward with their lives."

Greg was a staff psychologist at John H. Stroger, Jr. Hospital of Cook County for 26 years where he directed the mental health services for the Adolescent & Young Adult Clinic and coordinated the child and adolescent inpatient and emergency room consultation-liaison service. He received his doctorate in clinical psychology from the Illinois School of Professional Psychology and completed his internship and a health psychology fellowship at Cook County Hospital. Greg provides consultation to schools, holds workshops for medical residents, and provides forensic psychological evaluations for immigrants and refugees who are seeking asylum. He does evaluations and staff trainings on trauma for the Young Center for Immigrant Children’s Rights at the University of Chicago and for the Physicians For Human Rights.

Greg is married and has one child. He enjoys reading, listening to music, and running. He is an avid sports fan and is actively involved in the life of his church community where he is an elder.

Greg can be reached at
(630) 653-2300 ext. 500.