Moriarity received his undergraduate degree from Notre Dame in 1972 and is a graduate of the University of Southern California School of Medicine. He completed his residency in family medicine in 1979 at Saint Joseph's Medical Center in South Bend. He is board certified in family medicine and holds a C.A.Q. degree in primary sports medicine.
Moriarity is a participant in the American Medical Society for Sports Medicine. He is a fellow in the American College of Sports Medicine and will become president of the organization in 2005.
The Notre Dame National Monogram Club awarded him an honorary monogram in 1999.
Moriarity and his wife, the former Vickie Young, are both natives of Cambridge, Ill., and the couple has two children, John, a graduate of the University of Portland who lives in Seattle and Jane, a graduate from the School of the Art Institute in Chicago.