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.

My mission is to create a positive healthcare experience for patients and their families.

It is a privilege to build long-term relationships with my patients and their families and to be able to care for them through all stages of childhood, especially when they’re not feeling well.  I believe that it’s important for children to receive care in an environment where they feel comfortable.  In my free time, I like to read, go to the beach and spend time with family.

My mission is to diagnose, educate and treat patients about their orthopedic conditions.

Whether the time we spend together is short or long term, I strive to ensure all patients understand the nature of their conditions, and I look forward to see their progression and improvement throughout our journey together. I was born and raised in Weymouth, because of this, I am excited and honored to serve the community I grew up in.