William W Tollefsen, MD

Photo of Will Tollefson, MD Emergency Medicine


Emergency Medicine


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.

Board Certifications





New York Medical College
Boston University

Internships and Residencies

Brigham and Women's Hospital


University of Massachusetts Memorial Worcester

South Shore Hospital
55 Fogg Road
South Weymouth, MA 02190
United States

Location Hours

Sun: All day open Open 24 Hours
Mon: All day open Open 24 Hours
Tue: All day open Open 24 Hours
Wed: All day open Open 24 Hours
Thu: All day open Open 24 Hours
Fri: All day open Open 24 Hours
Sat: All day open Open 24 Hours.