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Laurence L. Greenhill, MD, is the Ruane Professor of Clinical Child and Adolescent Psychiatry at the Division of Child & Adolescent Psychiatry, Department of Psychiatry, at the Columbia University Medical Center. Dr. Greenhill’s clinical expertise is in the diagnosis and treatment of ADHD, depression, and anxiety disorders in children and adolescents. In addition to his clinical work, Dr. Greenhill is co-chair of the New York State Psychiatric Institutional Review Board (IRB). Before the IRB work, he engaged in research on the safety and efficacy of medications to ameliorate psychiatric symptoms in youth, with specific projects in determining the long-term benefits and safety of medication treatments on preschool children with attention-deficit/hyperactivity disorder (ADHD) and conducted research trials on the efficacy of different types of treatment to reduce suicidal behaviors in depressed adolescents. He is also past president of the American Academy of Child and Adolescent Psychiatry. Dr. Greenhill graduated from the Albert Einstein College of Medicine at Yeshiva University in 1967. Dr. Greenhill is board certified in child and adolescent psychiatry and psychiatry. He has been in private practice for 39 years.