Marcin received his MD from the Saint Louis University School of Medicine and completed his general psychiatry residency and an MS in Clinical Research at Emory University. He then completed his training in child and adolescent psychiatry with an emphasis in clinical research at Emory, where he also served as chief resident. He has worked as a clinician for the past decade in Georgia, Oregon and California, and most recently served with the San Francisco Department of Public Health as the medical director of the O.M.I. Family Center.
Marcin is a member of the American Academy of Child and Adolescent Psychiatry (AACAP) and the American Academy on Communication in Healthcare, and has been recognized previously with a number of honors, including the American Psychiatric Association/Lilly Resident Research Award, the AACAP Presidential Scholars Award and the Emory University School of Medicine Teaching Award. In addition to his clinical and education work, Marcin has published research on arousal and attention dysregulation in children with cocaine exposure, the neurobiology of social phobia, and antidepressant treatment of cytokine-induced mood disorders.