In October 2025, Greenwich Hospital named Kourtney Koslosky, MD, as chair of its Psychiatry and Behavioral Health department. Dr. Koslosky has more than ten years of experience at Yale School of Medicine and the Yale New Haven Health System.
“My collective background gives me a unique perspective, and this was an opportunity to consolidate my experiences to take on this new role as chair,” said Dr. Koslosky. She previously served as section chief of Psychiatric Emergency Services at Yale New Haven Hospital, overseeing a team that evaluates over 9,000 patients annually in the emergency department.
Dr. Koslosky began her work at Greenwich Hospital in 2012 as a consulting psychiatrist before joining the Psychiatric Emergency Services team in 2014. Her responsibilities have included patient evaluation and treatment, as well as residency training and guidance on treatment planning at Yale New Haven Hospital. Reflecting on her decision to pursue the chair position, she stated: “It felt like the perfect time for me to test my leadership skills in a new environment.”
She noted that community support influenced her choice to accept the position, especially following the recent launch of Greenwich Hospital’s Adolescent Intensive Outpatient Program (IOP) in partnership with Greenwich United Way. “I've seen an increasing number of children and adolescents presenting to our [Greenwich Hospital] Emergency Department in crisis,” Dr. Koslosky said. “There is an incredible need for behavioral health services in this population, and we are very fortunate to have been able to start our adolescent program. We are one of the only programs in our area offering this level of care.”
The Adolescent IOP provides group therapy for patients aged 13–17 who require more support than weekly individual therapy but do not need inpatient hospitalization.
For adults dealing with bipolar disorder, depression, mood disorders, schizoaffective disorder or schizophrenia, Greenwich Hospital’s Interventional Psychiatry Service offers treatments such as electroconvulsive therapy (ECT), ketamine and esketamine. Dr. Koslosky expressed plans for service expansion: “I hope to expand these services.”
Research led by John Krystal, MD—physician-in-chief of Psychiatry at Yale New Haven Hospital—demonstrated that ketamine works differently from standard antidepressants and can produce rapid effects for those with certain psychiatric conditions. The FDA approved esketamine nasal spray derived from ketamine in 2019 for clinical use.
“These treatments have enormous benefits in treating many psychiatric conditions,” Dr. Koslosky added. “Results can be quicker than traditional medications, helping people achieve an improved quality of life. I have been fortunate to see in real time the modern breakthroughs of its success.”
Greenwich Hospital’s Department of Psychiatry and Behavioral Health also offers geriatric psychiatry services alongside its adolescent and adult programs.
“Each age group experiences different life challenges,” said Dr. Koslosky. “However, if mental health is addressed early on, it serves as the solid foundation necessary to carry people through each stage of life.”
Dr. Koslosky emphasized her commitment to expanding innovative mental health services with a multidisciplinary approach: “We have an incredible team who are devoted to our patients, and I am looking forward to our work together.”
Greenwich Hospital is part of Yale New Haven Health System and serves lower Fairfield County in Connecticut and Westchester County in New York with 206 beds including specialized units for newborns. It is affiliated with Yale School of Medicine.
Since opening in 1903, Greenwich Hospital has grown into a teaching institution providing medical care across specialties along with wellness programs; it holds Magnet designation from the American Nurses Credentialing Center for nursing excellence.
