He received his Ph.D. in Counseling Psychology in 1998. He currently is an adjunct Associate Professor of Psychology and Education at Teachers College, Columbia University where he supervises doctoral students and teaches a course in Group Work with Children and Adolescents to School Psychology students. He has led support groups for people with AIDS and their caregivers at Gay Mens Health Crisis and currently leads a support group for adult children caring for a parent with Dementia. Dr. Koski also has completed a three year program at the National Institute for the Psychotherapies in Psychoanalytically informed psychotherapy. Dr. Koski is an adjunct Assistant Professor of Applied Psychology at the Steinhardt School, NYU and has taught the course: Internship in Mental Health and Wellness for over 15 years. Dr. Koski worked as a teacher and guidance for the New York City Department of Education for over 30 years.