Parents of preschoolers through teens; also of interest to mental health professionals and pediatricians.

Jonathan Caspi, PhD, MSW, is Professor of Family Science and Human Development at Montclair State University in New Jersey. Dr. Caspi is an internationally recognized sibling expert. In addition to researching, writing, and teaching about families and siblings, he has been a family therapist for over 30 years, and has a private practice in New Jersey.