[3] After completing his pre-university studies at Christian Brothers Academy, he graduated from Syracuse University, obtaining a dual degree in philosophy and biology in 1980.

[3] He entered the College of Saint Sophia in Rome where, as a student of the Lviv Archeparchy under Cardinal Josyf Slipyj, he attended the Pontifical Urban University.

In 1983 he graduated in theology and began doctoral studies in an interdepartmental program of Slavic and Byzantine Cultural History at Harvard University, where he received his Ph.D. in 1992.

[4] His thesis, Crisis and Reform: The Kyivan Metropolitanate, the Patriarchate of Constantinople, and the Genesis of the Union of Brest, was published by the Harvard Ukrainian Research Institute in 1998.

[5] From October 1994 until July 1995 he attended the Pontifical Oriental Institute, examining in particular the synthesis of neopatristic Orthodox theologian Georges Florovsky and receiving licentiate in Eastern Christian Studies.

[17][18] In 2021, Archbishop Gudziak was the commencement speaker during Saint Charles Borromeo Seminary's 2021 Concursus Author and editor of books and articles on church-historical, spiritual, and theological topics in different languages, as well as texts on modern church life, development and reform of higher education, spirituality of architecture, and other issues of public, social, cultural and political life.

[19] His most important publication is "The Kyivan Metropolitanate, the Patriarchate of Constantinople, and the Genesis of the Union of Brest" Co-founder and co-editor of the church history journal "The Ark" (1993).