Dr Jon Klein is Associate Vice-chancellor for Research, the Savithri and Samuel Raj Professor of Pediatrics, and Executive Vice-head of the Department of Pediatrics at the University of Illinois at Chicago (UIC) College of Medicine. Dr Klein is a specialist in adolescent medicine and health services research, known for his leadership and expertise in adolescent preventive services, tobacco control, and translation of research into practice and policy. Dr Klein joined the faculty at UIC in 2017, having spent 1992–2009 at the University of Rochester and 2009–17 as Associate Executive Director at the American Academy of Pediatrics. He is President-elect of the International Association for Adolescent Health and serves as treasurer and a member of the Executive Committee of the International Pediatric Association, and as Vice-chair of the accountability work-group of the Partnership for Maternal, Newborn and Child Health.