Marc Ettensohn, MD is the Founder and CEO of Cornerstone Psychiatric Care, where he leads with a strong focus on innovative, evidence-based treatments for psychiatric disorders. He earned his medical degree from the University of Louisville School of Medicine and completed his psychiatry residency at the University of Florida College of Medicine, where he also served as Chief Resident. Dr. Ettensohn pursued advanced training through an ECT fellowship at Emory University and an administrative fellowship at the American Board of Psychiatry and Neurology, further expanding his expertise in interventional psychiatry.

Before establishing Cornerstone Psychiatric Care, Dr. Ettensohn served as Medical Director at Actify of South Florida, where he specialized in the use of intravenous and intranasal ketamine for treatment-resistant anxiety and depression. Today, at Cornerstone, he continues to advance interventional psychiatry with a strong emphasis on ketamine therapy, hospital consultations, and inpatient psychiatric care.

As a Diplomate of the American Board of Psychiatry and Neurology, Dr. Ettensohn also serves as an ambassador and committee member for the Board. He is actively involved in professional organizations including the American Psychiatric Association, The Florida Psychiatric Society, and the American Society of Ketamine Physicians. His academic contributions include coauthoring peer-reviewed publications on ketamine’s role in psychiatric treatment, such as Advances in Psychedelic Medicine: State-of-the-Art Therapeutic Applications and The Rise of Ketamine in Clinical Practice.