My goal is to work collaboratively with patients and their families as well as the entire care team to support critically ill patients. Clinical care and working with the entire medical team to support patients and their families are my primary passions. I am also involved in ongoing research using imaging studies to better diagnose, monitor and understand lung disease and critical illness. Outside of work, I am an avid runner and sailor, and love spending time with my family.

Dr. O'Brien is Medical Director of Maternal-Fetal Medicine at South Shore Health. 

As a Maternal-Fetal Medicine physician, I am dedicated to caring for women and families navigating high-risk and medically complex pregnancies with expertise, compassion, and individualized attention. 

I strive to integrate evidence-based medicine with a holistic approach that recognizes the physical, emotional, and social factors that shape each patient’s experience. 

I am also committed to advocating for equitable healthcare and improving access and outcomes for marginalized and underserved communities.

I strive to provide excellent care to my patients and to help them understand their conditions through education.

As a rheumatologist, my goal is to take care of my patients as individuals and to work together with them to find the most effective treatment plan. I am passionate about helping patients with rheumatologic conditions find relief with the therapies we have available today. Outside of work, I enjoy playing tennis, exploring new restaurants, and spending time with family and friends.

In my career as an emergency physician, I have gotten to take care of patients in both the usual emergency department setting as well as some other unusual environment. Regardless of the location, one thing remains the same - it is about the patient and the care they need at a time of medical crisis. I spend most of my time outside of work, still engaged in medicine with a variety of emergency response organizations as well as the military.

My mission is to provide patient-centered care allowing our patients to access trustworthy and well-informed care.

My personal philosophy in life is to be kind and compassionate. My background is in adult-gerontology and neurosurgery. I aim to create patient-centered relationships where my patients feel comfortable disclosing any concerns. In addition, I aim to provide open communication. Outside of work, I enjoy volunteering at a local nursing home and a local food bank, and performing in an dance group in ballet, jazz, contemporary and hip hop. I also enjoy hiking and exploring local trails.

My goal is to use my experience and training to provide personalized OB/GYN care to women to achieve healthy pregnancies and lifestyles.

I knew at the age of 5 that I wanted to be a doctor. All of my life choices have led me here. I could never see myself in any other career. It is a privilege to support and guide my patients through their hardest times, while also experiencing the joy of their happiest times. I love to tailor their medical care to them as individuals, focused on their needs and lifestyles to achieve the best outcomes. Personally, I enjoy spending tune with my family and friends, entertaining and traveling.

My treatment philosophy is to help educate individuals on their role in disease prevention and develop relationships with patients—working as a team to manage both chronic and acute health issues. I believe that each individual has their own unique set of circumstances that influence their health and working together to overcome barriers is an essential part of providing healthcare. I consider it a privilege getting to know patients and families and always look at the big picture when caring for individuals. Outside of work I love spending time with my family, going to the beach, gardening and hiking. I am teaching myself how to ice skate so I can play hockey with my boys! 

I believe in the prevention of disease and the promotion of healthy lifestyles for all children through education and dedication to quality care.

I like to treat each patient and family as individuals. I enjoy earning their trust and getting to know them as well as helping to navigate their child’s successes and challenges. I take pride in making sure we have full and open communication in our visits and your visit never feels rushed. My mission is to provide our patients with the best and most comprehensive pediatric care possible from birth until 21 years of age. I adhere to the “Golden Rule” in my life and practice which is the principle of treating others as one wants to be treated. Outside of work I enjoy exercising, horse back riding, and spending time with my family. I am an avid animal lover and we have many animals in our family.

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.  

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.