Dr. Ng is a child, adolescent, and adult psychiatrist with an interest in HIV, public psychiatry, and family issues.

He is the Medical Director of Outpatient Behavioral Health and the Director of clinical services for the Division of Child and Adolescent Psychiatry at Columbia University Medical Center (CUMC) and NewYork-Presbyterian/Morgan Stanley Children's Hospital. His is also the NYP Behavioral Health Service Line Clinical Innovation Officer.

He is the past president of the American Academy of Child and Adolescent Psychiatry and the New York Council on Child and Adolescent Psychiatry. He served on the Assembly and the Council on Children, Adolescents, and Families at the American Psychiatric Association (APA).