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Peter Theodore Masiakos, MD

Director, Pediatric Trauma Services

Director, Pediatric Surgery Quality and Safety Committee

Dr. Masiakos is a pediatric and neonatal general surgeon who is an internationally recognized pediatric trauma surgeon and injury prevention specialist. He is a current member of the American College of Surgeons Committee on Trauma.

Pediatric Surgery
Department of Surgery


  • MassGeneral Hospital for Children
  • Trauma
  • Surgery: General, Thoracic, & Minimally Invasive
  • Trauma Center
Clinical Interests
Trauma and injury prevention
Minimally invasive pediatric surgery
Esophageal anomalies
Thyroid surgery
Pediatric Neoplasms
Pediatric thoracic surgery
Pilonidal disease
Chest Wall Deformities (Pectus excavatum & Pectus Carinatum)
Inflamatory Bowel Disease
Boston: Massachusetts General Hospital
Newton: Newton-Wellesley Hospital
Medical Education
MD, Boston University School of Medicine
Residency, Boston Medical Center
Fellowship, Toronto Hospital for Sick Children
Board Certifications
Surgery, American Board of Surgery
Pediatric Surgery, American Board of Surgery
Patient Gateway
Yes, learn more
Foreign Languages
Patient Age Group
Adult and pediatric
Accepting New Patients
Accepting New Patients

BiographyPeter T. Masiakos, MS, MD, FACS, FAAP is a Pediatric General and Thoracic Surgeon at MGH and Associate Professor at Harvard Medical School. He was trained at the Boston City Hospital and Hospital for Sick Children (Toronto), where he developed a clinical interest in pediatric trauma care and injury prevention. He is the director of the pediatric trauma surgery service at MGH and has become a vocal injury prevention advocate. He has broad interest in clinical surgery with a focus on esophageal anomalies, thyroid surgery and pilonidal disease. He has also been involved in successfully educating the Massachusetts legislature and the US Congress on the inherent risks that that certain products pose to children and has testified both at the Massachusetts state house and at the consumer product safety commission on the need for new legislation which would prohibit the use of ATVs within specific age groups.  He has aided in the development and passage of several forward thinking injury prevention laws and continues to work alongside Massachusetts State Legislators and the Congress on several other comprehensive injury prevention laws including junior operator laws, safe driving laws and child restraint laws.

Shining more light on pediatric trauma

New MassGeneral Hospital for Children trauma clinic helps kids recover.

Post-trauma treatment

MGH Hotline 4.3.09 It was just another soccer tournament for 14-year-old Megan Lund, a freshman at Needham High School, as she played on a field in Florida this past fall.

MGHfC residents visit the State House

MGH Hotline 06.12.09 In what’s become an annual tradition, residents, fellows and staff from MassGeneral Hospital for Children (MGHfC) made a special visit to the gold-domed building down the street to advocate for legislation affecting children's health.

MGHers successfully advocate for injury-prevention state laws

MGH Hotline 08.06.10 The caregivers at the MGH and MassGeneral Hospital for Children (MGHfC) support the health and well-being of adults and children in many ways. Recently, several hospital caregivers and administrators went a step further in their support of the health of their communities when they played important roles advocating for several injury-prevention state laws.

MGH and MGHfC celebrate passage of three child-safety laws

MGH Hotline 11.12.10 On Oct. 21, members of the MGH and MassGeneral Hospital for Children (MGHfC) gathered with state legislators and advocates to commemorate the passage of three Massachusetts child-safety laws.

Sophia's Story

At 29 weeks, Sophia O'Brien was born with multiple medical issues. But with help from her MassGeneral Hospital for Children team, she has grown into a healthy ballerina.

Honoring pioneers past and present

Quality and cost are two of the most important drivers of innovation in health care today. At the MGH, the Bowditch Prize is awarded annually to individuals or groups who are able to achieve substantial improvement in both of these areas.

Pediatric Surgery
55 Fruit Street
Boston, MA 02114-2696

Phone: 617-726-8839
Fax: 617-726-2167

Pediatric Surgery
55 Fruit Street
Boston, MA 02114-2696

Phone: 617-726-8839
Fax: 617-726-2167

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