Ryan Callahan, MD

Interventional Cardiologist

Instructor of Pediatrics, Harvard Medical School

    Contact: 617-355-8228
  • Fax: 617-730-7548

"I believe in establishing a relationship with patients and families based on trust and good communication."

Medical Services


  • Interventional Cardiology
  • Cardiology


  • Cardiology


  • Cardiac Catheterization Labs
  • Cardiovascular Program
To schedule an appointment: Call 617-355-8228 or Request an Appointment

I believe in establishing a relationship with patients and families based on trust and good communication.  

I will be accessible and an advocate for my patients every step of the way. A strong interest in anatomy and physiology as well as enjoyment in caring for others is what initially led me to pursue a career in medicine. As a physician, I also find reward in the ability to discover new knowledge and therapies through research as well as teach future pediatric cardiologists. Ultimately, it is the relationships I make with patients and families and the potential to make a difference in their lives the most fulfilling.

Experience and Education


Medical Degree

Drexel University College of Medicine, 2008

Philaadelphia, PA

Residency - Pediatrics

Children's Hospital of Pittsburg of UPMC, 2011

Pittsburgh, PA

Fellowship - Pediatric Cardiology

Children's Hospital of Pittsburgh of UPMC, 2014

Pittsburgh, PA

Senior Fellowship - Interventional Cardiology

Boston Children's Hospital, 2015

Boston, MA

Professional History

Dr. Callahan was born in State College, Pennsylvania and remained local as an undergraduate at Penn State University. He subsequently attended Drexel University College of Medicine for his medical degree and completed his pediatric residency and pediatric cardiology fellowship training at the Children’s Hospital of Pittsburgh. Dr. Callahan then came to Boston Children’s Hospital where he completed a senior fellowship in interventional pediatric cardiology. As staff in the invasive cardiology division, his primary interest includes transcatheter management of congenital heart disease, with a focus on pulmonary vein stenosis and the treatment of right ventricular outflow tract dysfunction. Further, he is interested in simulation and applying it to the training of cardiology fellows in the catheterization laboratory.


Publications powered by Harvard Catalyst Profiles
  1. Callahan R, Bergersen L, Baird CW, Porras D, Esch JJ, Lock JE, Marshall AC. Mechanism of valve failure and efficacy of reintervention through catheterization in patients with bioprosthetic valves in the pulmonary position. Ann Pediatr Cardiol. 2017 Jan-Apr; 10(1):11-17.
  2. DeWitt E, Callahan R, Blume E, Marshall A, Mah D. Trans-Fontan baffle placement of an endocardial systemic ventricular pacing lead. HeartRhythm Case Rep. 2017 Feb; 3(2):129-132.
  3. Callahan R, Bergersen L, Lock JE, Marshall AC. Transcatheter Pulmonary Valve Replacement and Acute Increase in Diastolic Pressure are Associated with Increases in Both Systolic and Diastolic Pulmonary Artery Dimensions. Pediatr Cardiol. 2017 Mar; 38(3):456-464.
  4. Callahan R, Kreutzer J, Debrunner M. Transcatheter management of mid-aortic syndrome secondary to myofibroma presenting in infancy with severe left ventricular dysfunction: a case report. Cardiol Young. 2016 Apr; 26(4):799-801.
  5. Callahan R, Trucco SM, Wearden PD, Beerman LB, Arora G, Kreutzer J. Outcomes of pediatric patients undergoing cardiac catheterization while on extracorporeal membrane oxygenation. Pediatr Cardiol. 2015 Mar; 36(3):625-32.
To schedule an appointment: Call 617-355-8228 or Request an Appointment


Boston Children’s is so much more than a hospital—it’s a community of researchers, clinicians, administrators, support staff, innovators, teachers, patients and families, all working together to make the impossible possible. ”
- Sandra L. Fenwick, President and CEO

Boston Children's Hospital
300 Longwood Avenue, Boston, MA 02115
For Patients: 617-355-6000
For Referring Providers: 844-BCH-PEDS | 844-224-7337