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.

It is a privilege to help people in need get back to being healthy. Individualized care plans and communication are paramount to practicing medicine, I strive to provide the care patients need. Outside of work, I like to try new sports and spend time with family; diligently working to excel in golf.

With my role in healthcare I want to ensure that patients feel well informed and comfortable making decisions about their care.

I enjoy being able to work with patients from a variety of different back grounds and help them through their hospital stay. I want patients to feel informed and included in their health care decisions. Outside of work I enjoy doing anything to move my body from rock climbing and skiing to running and strength training.

A hospitalization is often wrought with difficult news and decisions; it is my honor to care for patients at these times. I enjoy working with a care team, to deliver high-quality care. Above all, I try to foster sincere relationships with patients, focusing on what is most important to each person.   

My goal is to provide compassionate and equitable medical care to patients seeking care for breast-related concerns, including but not limited to breast lumps, abnormal screening mammograms, benign breast masses, and previous or current breast cancer diagnoses. 

I am a graduate of the Tufts University School of Medicine Physician Assistant and Masters in Public Health dual degree program. I have been working at the Dana-Farber Cancer Institute/Brigham & Women’s Hospital Division of Breast Surgery since June 2021.

It is my priority to provide care to patients that is skilled and supportive. I strive to accommodate a patient’s unique and individual needs such that all patients feel cared for and well-informed. I have professional interests in patient-oriented outcomes research and have studied coping and psychosocial wellbeing among adolescents and young adults with cancer. I am originally from Western Massachusetts, and my hobbies include hiking, skiing, and spending with family, friends, and my dog.  

I completed my Master’s Degree as an Adult Nurse Practitioner at Northeastern University and earned my bachelors of Science degree from The College of the Holy Cross as a Biology Major and Philosophy minor. I worked as a registered nurse at MGH on a cardiac step down unit and then an NP in a busy nursing home practice and in two community health centers. I enjoy being active and spending time outdoors with my husband and two children.

My goal is to help patients and families manage the acute illness that lead to hospitalization and transition to a healthy life outside the hospital environment.

I am passionate about effective management of acute medical issues while providing clear and concise medical information. In addition to clinical practice, I am interested in using technology innovations to improve patient health.

Outside of work, I am an avid SCUBA diver. 

My mission is to provide comprehensive care and holistic support to patients throughout their cancer journey.

With over a decade of service in healthcare, I have expertise in clinical practice, research, and patient-centered care. I earned my Doctor of Nursing Practice degree from UMASS Worcester. My experience ranges across inpatient and outpatient settings, including hematology, oncology, clinical research, medical/surgical care, and primary care.  Outside work, I enjoy sailing and spending time with my family including our dog Una. 

My mission is to teach patients how better health habits can prevent many diseases.  

It is a privilege to help people and establish long-term relationships with my patients. I believe that everyone's medical care should be individually tailored. We all have unique characteristics that need to be considered when deciding a treatment plan. Communication is paramount. Outside of work, I love rock climbing and surfing; however, most importantly I love spending time with my family.

I received my undergraduate degree from Harvard University. I completed my medical degree at the Robert Wood Johnson Medical School in Camden, NJ. My surgical and urological residency took place at the State University of New York Health Science Center in Brooklyn, NY. I am certified with the American Board of Urology and am passionate about providing high quality patient care in a compassionate environment.