William Tollefsen, MD is the EMS and MIH Medical Director for South Shore Health. Dual-boarded in Emergency Medicine and EMS Medicine, Dr. Tollefsen works clinically as an Emergency Physician at South Shore Health in addition to his role as EMS Medical Director.

One of few physicians in the country to receive the prestigious "FAEMS" recognition, Dr. Tollefsen is also the Medical Director for OEMS Region IV, serving 61 cities and towns of the Metro-Boston EMS Council. As the current EMS Medical Director for eight municipal and three private ambulance services on the South Shore, Dr. Tollefsen interacts and provides oversight for over 400 Paramedics.

Dr. Tollefsen graduated from New York Medical College and completed residency training in Emergency Medicine at Harvard University, Brigham and Women's, and Massachusetts General Hospital. He completed a fellowship in Emergency Medical Services and Critical Care Transport at the University of Massachusetts, where he worked as an Emergency Physician and Flight Physician for UMASS LifeFlight. He completed an MBA at the Isenberg School of Management at UMASS Amherst, and holds a Master of Medical Science degree from the Boston University School of Medicine.

A former pre-hospital provider, he is actively involved in EMS system design, paramedic education and Critical Care Transport Systems. He works closely with multiple EMS, Fire and Law Enforcement agencies throughout Massachusetts.

His research interests include systems of care, resuscitation, airway management, and paramedic education.

I strive to build a space where patients feel safe to discuss their health concerns and engage in shared decision-making.

Prior to joining South Shore Health, I had the privilege to train at UMass Family Medicine Residency and complete an additional year of fellowship to also care for patients living with HIV/viral hepatitis at the Family Health Center of Worcester.

Outside of work, I love spending time with my family, running, gardening, and camping/hiking.

I am originally from Cambridge, Massachusetts. I practiced in Quincy for 30 years before coming to South Shore Medical Center in 2002. I am experienced in abdominal surgery, trauma, and management of skin and soft tissue tumors. 

I strive to educate patients about their health conditions in order to best include them as part of the treatment team.

Brendan has spent a large portion of his career practicing in Primary Care following graduation from MCPHS University in 2014.  Having grown up in Massachusetts, as well as living and working in Southeastern Mass he has formed close relationships with his patients as they are frequently his neighbors, mechanics, former teachers and the like. From these relationships, he has learned the importance of community as part of a medical treatment plan, and this has now become an important aspect to the way he practices medicine. He is very excited to extend his medical career into the South Shore Health Community. 

As a doctor at Brigham and Women's Harbor Medical Associates, I work to maintain our commitment to delivering prompt, expert and compassionate care.

I graduated from Tufts University and received my medical degree from Albany Medical College in Albany, NY. I completed my surgical and urological residencies at Massachusetts General Hospital. I am certified by the American Board of Urology and I strive to provide the highest quality patient care in a warm compassionate environment.