Maryellen Horgan, PA-C Physician Assistant, Department of Cardiac Surgery Image Phone 617-355-4092 Email Email Me Print Profile Request an Appointment Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115 Listen Maryellen Horgan, PA-C Physician Assistant, Department of Cardiac Surgery Medical Services Programs & Services Heart Center Cardiac Surgery Conditions & Treatments Congenital Heart Defects Languages Vietnamese English Locations Boston Boston Children's Hospital 300 Longwood Ave. Boston, Massachusetts 02115