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 journey to becoming a physician has led me not only to multiple states, but also abroad to Haiti and Jordan on medical mission trips. I am continually learning from my patients and their experiences. I translate this clinical knowledge to all of my new patients. 

Outside of work I enjoy exercising, traveling, and spending time with my family

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 goal is to help empower women and families and encourage them to be active participants in their care. 

I became familiar with midwifery care 20 years ago when I gave birth to my daughter with a group of amazing midwives. I was an experienced Labor and Delivery nurse at the time but, after my experience with the midwives, I knew that becoming a midwife was my true calling. I find every birth that I attend to be unique and special in its own way. I strive to help women achieve the labor and birth they desire. Everyone is different, and I enjoy getting to know families and helping them navigate this very pivotal time in their lives. In my free time, I enjoy hiking, paddleboarding, and crocheting.