The unique biologic characteristics and behaviors of children make them vulnerable to environmental toxicants. Physicians and other health professionals are challenged in addressing pediatric environmental health care needs in part because of deficient knowledge and skills in pediatric environmental health. This deficiency seems to stem from inadequate exposure to the field of pediatric environmental health during clinical training. The foundational goal of the PEHSU program is to address the gap in pediatric environmental health knowledge by enhancing the fundamental knowledge and skills of pediatricians, primary care physicians, and other health professionals.