[2] He also worked as an intern at the Icahn School of Medicine at Mount Sinai and received his postgraduate training at Columbia University and the New York Presbyterian Hospital.
He is a member of the American College of Psychiatrists,[5][6] American Psychiatric Association,[7] Benjamin Rush Society, International Society for the Study of Personality Disorders,[8] and he is a fellow of the Royal College of Physicians of Edinburgh.
Today, Oldham serves as the treasurer of the American College of Psychiatrists, the president of the South Carolina Psychiatric Association, he represents the American Psychiatric Association in the American Medical Association, and he works as the distinguished emeritus professor at the Menninger Department of Psychiatry and Behavioral Sciences in the Baylor College of Medicine He, along with Lois B. Morris developed the NPSP25.
[8][12][13] Oldham has published over 200 journal articles and books on these subjects and is internationally recognized as a leading figure in the psychiatric community.
[2] He is the editor of the Journal of Psychiatric Practice, the Joint Editor of Journal of Personality Disorders, and the Joint Editor-in-Chief of Borderline Personality Disorder and Emotion Dysregulation.