DANIEL HALLER, MD

Daniel Haller, MD is a distinguished surgeon, physician leader, educator, and healthcare entrepreneur dedicated to advancing surgical excellence and compassionate patient care. Board certified in General Surgery and Surgical Critical Care, he is a founding member of Long Island Surgical PLLC, where he specializes in advanced minimally invasive and robotic surgery, trauma, and acute care surgery. Throughout his career, he has combined clinical expertise with a passion for innovation, education, and improving the delivery of healthcare throughout Long Island.

Dr. Haller currently serves as President of the Executive Medical Staff, Chair of the Department of Surgery and Trauma medical director at Mercy Hospital. His leadership is rooted in the belief that exceptional healthcare begins with the people who provide it. He has championed a culture of collaboration, mutual respect, and professional support while working to expand Mercy’s clinical capabilities, advance surgical innovation, and strengthen its position as a center of excellence. A dedicated educator and mentor, Dr. Haller is actively involved in training the next generation of physicians, teaching medical students, surgical residents, and practicing surgeons while sharing his expertise and passion for advancing the field of surgery. 

Dr. Haller earned his medical degree from the Technion, Israel Institute of Technology, completed his surgical residency at Maimonides Medical Center, and his fellowship in Surgical Critical Care at North Shore University Hospital. He also holds an MBA from Case Western Reserve University and has pursued executive education at the Wharton School of the University of Pennsylvania, including its Healthcare Leadership and Management Program. Beyond his professional accomplishments, he values family, mentorship, and the lasting relationships built throughout his career. His dedication to Mercy reflects his belief that a hospital’s greatest strength is its people and that the most meaningful measure of success is the positive impact we have on the lives of others. 

Mercy Hospital is proud to have selected Dr. Haller for the Theodore Roosevelt Award for Outstanding Service in recognition of the meaningful difference he has made at Mercy through his leadership, dedication, and unwavering commitment to the hospital, its patients, and its people.