Dr McGrath is a graduate of the Georgetown University School of Medicine.  He completed a General Surgery residency at Cedars-Sinai Medical Center and a Thoracic Surgery residency at the University of Pittsburgh.  He also completed a fellowship in Congenital Heart Surgery at the Children's Hospital of Pittsburgh.  He was in practice with Mid-Atlantic Cardiothoracic Surgeons for 27 years in Norfolk VA before moving to Maine in 2016.

Dr McGrath retired from the US Navy after 30 years of reserve service and is a veteran of Operation Iraqi Freedom and deployments to Guantanamo Bay and to NYC for COVID response.

He and his wife Diana live in Falmouth with their two dogs.  They have five children between them.