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 help patients attain the best health possible; have full understanding of their health issues; and equip them to take partnership in managing their health.

It is a pleasure to be a part of the team that provides exceptional care during the perioperative period. My goal is to help improve and tailor the anesthetic experience for each patient. Outside of the hospital, I enjoy spending time with family, visiting new places, and hiking/jogging. 

My mission is to listen, teach and make every effort to help heal patients while providing empathy and emotional support during their most challenging times. 

Everybody has a right to quality health care and I am privileged to be part of a team that works towards achieving those goals. 

My philosophy is to engage patient is their own care.

I completed my residency at Cambridge Health Alliance in Cambridge, MA, often caring for underserved populations and immigrants.  I believe in engaging the patient in their own care and understanding any difficulty they may have in caring for themselves.