is Professor in the Departments of Psychiatry, Medicine, and Pediatrics; Director of Child and Adolescent Psychiatry; and Director of Behavioral Genetics at the University of Vermont College of Medicine in Burlington, Vermont. He is also Professor and Endowed Chair on Genetics of Childhood Behaviour Problems, Biological Psychology, at Vrije Universiteit in Amsterdam, The Netherlands, and Adjunct Professor of Psychiatry at Dartmouth School of Medicine in Hanover, New Hampshire.