My mission is the timely treatment of coronary artery disease with a strong focus on patient education and shared decision-making.

I enjoy the challenge of the diagnostic process of medicine, which is one of the many reasons I have chosen to work as a nocturnist, which is a hospital-based physician who works overnight. In my free time, I've been known to read books about the American Revolution and Colonial Period, or attend hard rock/metal concerts. Also, '90s music is in my head all of the time. 

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 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.  

Christopher Cannell DMSc, MPAS, PA-C practiced in acute care medicine including emergency medicine, orthopedic trauma, orthopedics, and hospitalist medicine.  He focuses holistically on the whole patient with an eye on wellness.

Dr. Cannell is a Doctoral Trained Physician Associate who as over 21 years of rich experience across the spectrum of healthcare including Emergency Medicine (CAQ advanced certification), Orthopedics (Sports, Hand, Trauma, Spine, and Joints), Critical Care, Urgent Care, and both Inpatient and Outpatient Internal Medicine. Dr. Cannell has played a pivotal role in program development and management, value-based care, and population health initiatives.  His leadership experience extends to roles such as ED department Lead APC, APC Director of large ambulatory practice, Hospital System Committee Member, program innovation, and PA/NP career ladder development. His healthcare dedication transcends beyond clinical practice, encompassing PA education, advocacy, leadership, and innovation.  

Dr. Cannell received his Doctor of Medical Science from the University of Lynchburg, his Master in Physician Assistant Studies from Massachusetts College of Pharmacy and Health Sciences-Boston, and his Bachelor of Arts in Psychology/Pre-Medical from Muhlenberg College.