My mission is to provide exceptional care to hematology and oncology patients, and support patients and their families when they are at their most vulnerable. 

It is a privilege and an honor to have the opportunity to establish meaningful, long-term relationships with my patients and their families. I believe in open, honest communication and a patient-centered model when formulating a treatment plan. I look forward to supporting my patients not only physically, but mentally and emotionally as well. 

Outside of work, I enjoy spin classes, going to the beach, and spending time with family and friends. 

I graduated from Colegio Nacional de San Isidro in Buenos Aires, Argentina and completed my medical degree at Buenos Aires University School of Medicine. My surgical and urological residency were spent at the Hospital Italiano in Buenos Aires. I was an attending Urologist at Hospital Roffo in Buenos Aires until I came to the United States. At that point I was a Urology Fellow working on a research project at the Children’s Hospital and Harvard Medical School in Boston. I completed my American residencies in urology and surgery at the University of Massachusetts.

I enjoy spending time with my wife and three children.

Growing up, my mother was a registered nurse and both of my parents were very service-minded. They taught me to give back to the community.

I fell in love with Family Medicine in my first year at Tufts. I became inspired to treat patients on a psychological, cultural, and emotional level, rather than just as a series of physical medical conditions.  

I enjoy traveling. I lived in Scotland for a year during my residency, and I have traveled to Nicaragua several times to work on a variety of global health projects. While there, I learned to speak Spanish and love the opportunity to speak Spanish with patients here at home.

I enjoy cooking and trying foods from all over the world. I like tapping into my creative side as well, enjoying studio art, particularly oil painting and watercolors.

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 grew up in southern Maine and attended Harvard University for my undergraduate education. While at Tufts University School of Medicine and Mount Auburn Hospital in Cambridge, my focus was on primary care medicine. I believe in the dignity of each of my patients. Respect, compassion, and reliability are among my goals in patient care. In my free time, I enjoy the outdoors and the arts, usually in the company of my family. 

I find great satisfaction in treating the whole person and not just their illness. Understanding a patient's unique outlook on life is paramount to providing proper care. Each patient has a voice which should not only be heard but appreciated.

Outside of work, I enjoy time in the woods; hiking, fishing and kayaking with family and friends. 

I grew up in Scituate and am a proud graduate of Scituate High School.  After graduating from Harvard-Radcliffe, I continued doing another year of diabetes research at Massachusetts General Hospital, then did two years of breast cancer research at the Dana-Farber Cancer Institute.  I graduated from the Boston University School of Medicine, went to UMass Worcester for residency, graduated from the Harvard School of Public Health, and then went to Brown for residency.  I began working at South Shore Medical Center in 2008.  I especially enjoy seeing patients who knew my father, a police officer in Scituate for 29 years and hearing their stories about him.  I try to motivate, encourage and work with my patients and it is an honor and a privilege to be able to care for them.  Outside of work, I love dancing, playing frisbee, and spending time with my family. 

My philosophy is to develop an ongoing patient-physician relationship focused on comprehensive health care incorporating preventative care, chronic disease management, and treatment of acute illnesses and injuries.

As a family doctor, I am dedicated to treating the whole person. I aim to develop long-term relationships to understand each patient, and to provide continuing health care for the individual and family. I integrate care for patients of all genders and every age from newborns to seniors, and I advocate for the patient in our complex health care system. I have had the fortune to work as a general practitioner in New Zealand which allowed me to gain insight into alternative health care systems and approaches to preventative care and disease management. Outside of work, I enjoy traveling, cooking, and reading.

I have been a physician's assistant in women’s health for close to 30 years on the South Shore. I enjoy seeing women in their many phases of life. I feel privileged when patients I met at the start of my career bring their daughters and granddaughters in to see me for their care. When not working, I enjoy spending time with my family.

My goal is to communicate effectively with patients so they have the understanding to make informed decisions for their own health. It is very humbling to work in a field that involves caring for others. I am continually inspired by my patients and the ability grow a patient-provider relationship over time.  As health care professionals, patients are the focal point of all that we do. Outside of work I enjoy being active outdoors, playing piano, and spending time with loved ones.