Mary O'Brien, RN, MHA/MSN, NE-BC Senior Director, Nursing and Patient Care Operations Image Print Profile Request an Appointment Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Listen Mary O'Brien, RN, MHA/MSN, NE-BC Senior Director, Nursing and Patient Care Operations Medical Services Programs & Services Cardiac Intensive Care Heart Center Cardiology Languages English Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115