Mark Zimmerman, M.D. is Professor of Psychiatry and Human Behavior at Brown Medical School. As a research assistant in the University of Iowa Department of Psychiatry he was co-author of the first semi-structured interview to assess DSM-III personality disorders (subsequently updated for DSM-IV/DSM-5).

He is the principal investigator of the Rhode Island Methods to Improve Diagnostic Assessment and Services (MIDAS) project. The goal of the MIDAS project has been to integrate research methodology into routine clinical practice to improve clinical practice. The MIDAS project is one of the largest clinical epidemiological studies using standardized measures that has been conducted in routine clinical practice.

The MIDAS project has been ongoing for nearly 30 years. Dr. Zimmerman and colleagues were the first group to recognize that bipolar disorder is sometimes overdiagnosed, and that borderline personality disorder is often underdiagnosed. More recently they examined the significance of having both bipolar disorder and borderline personality disorder.

In total Dr. Zimmerman is the author of nearly 500 articles published in peer-reviewed journals, and he is on the editorial board of 10 journals. He is the associate editor of the Journal of Personality Disorders, and he was the section editor of the Personality Disorders chapter for DSM-5-TR. He is the author of the recently revised Interview Guide to Diagnose DSM-5-TR Psychiatric Disorders and the Mental Status Examination.