Dr. Doyle completed his undergraduate education at the University of Arizona in Tucson where he majored in biochemistry.  This was followed by medical school at the University of Arizona and then Pediatric Residency at the University of Maryland in Baltimore.  He stayed an additional 4th year at the University of Maryland to serve as Chief Resident before obtaining his Pediatric Cardiology Fellowship training at Yale University in New Haven, Connecticut.

Dr. Doyle was hired in 1994 by Dr. Thomas Graham and tasked with the challenge of building a new pediatric interventional cardiology program.  There was no such program in Tennessee.  At the time of Dr. Doyle’s arrival, the institution was performing 160 catheterization procedures a year with the vast majority being diagnostic procedures.  Under the guidance of Dr. Doyle, the program has steadily grown and now has 3 interventional cardiologist who perform over 800 procedures a year with the majority of the procedures being therapeutic in nature.

Since his arrival at Vanderbilt, Dr. Doyle has been responsible for the introduction of numerous therapeutic techniques to not only Vanderbilt but also to the state of Tennessee.  These therapeutic techniques include percutaneous closure of a variety of congenital heart defects such as atrial septal defects, muscular ventricular septal defects, patent foramen ovale, and PDAs.  He introduced balloon angioplasty of coarctation and branch pulmonary arteries in addition to angioplasty of a variety of other congenital or acquired obstructive lesions.  He expanded balloon valvuloplasty to all ages including the neonate.  He introduced the use of vascular stents for the relief of a variety of congenital vascular lesions such as branch pulmonary artery stenosis, coarctation of the aorta, surgical conduit obstruction, systemic and pulmonary venous obstruction, and restrictive atrial septum.   In collaboration with Dr. Jim Loyd in pulmonary medicine, he pioneered the use of stents to relieve vascular obstructions in mediastinal fibrosis which is a progressive fibrotic reaction to previous infection with Histoplasmosis.  As a result, Dr. Doyle is now the world leader in interventional treatment of mediastinal fibrosis.  Working with his colleagues Dr. Janssen, and Dr. Nicholson, other techniques were introduced including radiofrequency perforation of atretic pulmonary valves and percutaneous implantation of transcatheter pulmonary valves.  The result of these efforts has led to the largest pediatric interventional cardiology program in the state and one of the largest in the country.

Despite these accomplishments, Dr. Doyle considers his greatest achievement to be his 32-year marriage to his wife, Margie, and the success of his 3 children, Catherine, Patrick, and Meghan.