He obtained his Ph.D. in Counseling Psychology from Marquette University. Dr. Holtz teaches a variety of classes related to child abnormal psychology, human development, counseling, and learning and memory. His private practice focuses on supporting families through divorce as a child specialist/therapist, parent coach, or family therapist. He also conducts psychological testing for school and legal related purposes and provides therapy for children and adolescents. Dr. Holtz publishes frequently with the majority of his research in the area of early childhood assessment.