Dr. Matthew Siegel is a board-certified child and adolescent psychiatrist assuming the role of Chief of Clinical Enterprise at Boston Children’s Hospital and Chief Behavioral Health Officer at Franciscan Children's Hospital in January 2024. Dr. Siegel came to Boston Children’s from MaineHealth, where he served as a Vice President of Medical Affairs and led an integrated continuum of care, research and training for the behavioral health needs of youth with developmental disabilities.

His research has focused on developing effective multi-disciplinary care for serious behavioral challenges and co-occuring psychiatric disorders in youth with developmental disabilities and characterizing those with profound autism. He founded and is the principal investigator of the Autism and Developmental Disorders Inpatient Research Collaborative (ADDIRC) and founded the first learning health network of inpatient units serving people with developmental disabilities. He has advised multiple state and federal agencies, hospitals and academic departments nationally on developing evidence-based mental health services for children and families. He is a scientist member of the NIH Interagency Autism Coordinating Committee, and an author of the American Academy of Child and Adolescent Psychiatry's practice guidelines for autism and for intellectual disability.