Westchester Medical Center Health Network Elevates Sean Tedjarati, MD, MPH, MBA, to Executive Leadership Role; Names Julia Keltz, MD, Interim Chair of Obstetrics and Gynecology

Appointments advance physician collaboration, women's health leadership and patient-centered care across the Hudson Valley

VALHALLA, NY - August 19, 2026 - Westchester Medical Center Health Network (WMCHealth) today announced two leadership appointments that support the network's continued focus on patient-centered care, physician collaboration and expanded access to specialty services across the Hudson Valley.

Sean Tedjarati, MD, MPH, MBA, has been promoted to Executive Vice President, Chief Physician Ambulatory Officer and Chief Medical Officer of the Medical Groups. In this expanded role, Dr. Tedjarati will lead efforts to strengthen physician engagement, support clinical integration and advance quality and safety across WMCHealth's hospitals and ambulatory network.

Julia Keltz, MD, has been named Interim Chair of Obstetrics and Gynecology for WMCHealth. Dr. Keltz succeeds Dr. Tedjarati in the department leadership role and will oversee obstetrics and gynecology services across the network, with a focus on coordinated, evidence-based care for women at every stage of life.

"Patients across the Hudson Valley benefit when outstanding physicians lead with vision, collaboration and a commitment to excellence," said David Lubarsky, MD, MBA, FASA, President and Chief Executive Officer of WMCHealth. "Dr. Tedjarati's expanded leadership role will help further align our physician enterprise and ambulatory strategy, while Dr. Keltz's appointment ensures continued momentum in women's health, education and clinical innovation. Together, these appointments reflect our commitment to delivering exceptional care close to home."

Dr. Tedjarati joined WMCHealth in 2009 and has held several leadership roles focused on advancing clinical quality, patient experience and systemwide collaboration. Most recently, he served as Chair and Director of Obstetrics and Gynecology at Westchester Medical Center and Senior Vice President and CEO of Advanced Physician Services of WMCHealth. He also previously served as Chief Clinical Integration Officer, helping align clinical services across WMCHealth's hospitals and outpatient locations.

A board-certified gynecologic oncologist and obstetrician-gynecologist, Dr. Tedjarati has helped expand women's health services in the region and co-founded WMCHealth's Center for Women's Health Equity with Dr. Keltz. He completed residencies in Family Medicine and Obstetrics and Gynecology at The Ohio State University and a fellowship in Gynecologic Oncology at MD Anderson Cancer Center. He holds a Master of Public Health from Johns Hopkins University and an MBA in Leadership in Healthcare from Yale University. He will continue to serve as Academic Chair and Professor of Obstetrics and Gynecology at New York Medical College.

Dr. Keltz, a board-certified obstetrician-gynecologist with fellowship training in minimally invasive gynecology, joined WMCHealth in 2017. She currently serves as Residency Program Director, Section Chief of Minimally Invasive Gynecology, Associate Professor and Associate Vice Chair of Education for Obstetrics and Gynecology at New York Medical College.

In partnership with Dr. Tedjarati, Dr. Keltz helped establish WMCHealth's obstetrics and gynecology residency training program and founded the Section of Minimally Invasive Gynecologic Surgery. She has been recognized for her leadership in medical education, curriculum development and clinical care, and brings extensive experience in comprehensive women's health services to her interim chair role.

These appointments reflect WMCHealth's ongoing commitment to integrated care, physician collaboration, and delivering exceptional outcomes for patients throughout the Hudson Valley.

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