Born in Steubenville, OH on May 23, 1949, to Nicholas and Jane (Green) DiNardo, Abp. DiNardo has a twin sister, Margaret, an older brother, Thomas, and a younger sister, Mary Anne. At the Catholic University of America, he obtained a B.A. and M.A. Degree in Philosophy. His theological studies were taken at the North American College, Rome , where he earned the S.T.B. Degree at the Gregorian University and the S.T.L Degree in Patristics at the Augustinianum.
Archbishop DiNardo was ordained a priest on July 16, 1977 in Pittsburgh , Pennsylvania and assigned to St. Pius X Church, Pittsburgh , as Parochial Vicar. In 1981 he was named Assistant Chancellor of the Diocese of Pittsburgh and part-time Professor at St. Paul Seminary. In 1984 he became a staff member of the Congregation for Bishops at the Vatican in Rome , Italy where he remained until December, 1990. During that time, he was also Director of the Villa Stritch (1986-1989), the house for American Diocesan priests who work for the Holy See, and also taught the Methodology Seminar for first year Theologians at the Gregorian University . In 1991 he was named Assistant Secretary for Education of the Diocese of Pittsburgh and also served as Co-Administrator of Madonna del Castello Church in Swissvale , Pa. In 1994, he was named founding Pastor of Sts. John and Paul Church in Franklin Park-Marshall Township , Pa. He was named Coadjutor Bishop of the Diocese of Sioux City on August 19, 1997 and ordained bishop on October 7, 1997. He became Diocesan Ordinary on November 28, 1998.
Currently serving on the Ad Hoc Committee to Oversee the Use of the Catechism for the United States Conference of Catholic Bishops, Archbishop DiNardo also serves as the USCCB Advisor to the National Association of Pastoral Musicians, and is a member of the Board of Directors of Catholic University of America, Washington, D.C., and the National Catholic Partnership for Persons with Disabilities, Washington , D.C.