Robert Sungenis

Robert A. Sungenis (born ca. 1955) is an American Traditionalist Catholic known for his Catholic apologetics and his advocacy of a pseudoscientific belief that the Earth is the center of the universe. He has made statements about Jews and Judaism which have been criticized for being antisemitic.

Robert Sungenis was brought up in a Roman Catholic household and converted to become a Protestant as a young man. He obtained his B.A. in religion from George Washington University in 1979, an M.A. in theology from Westminster Theological Seminary, a Presbyterian and Reformed Christian seminary located in Glenside, Pennsylvania, in 1982.

He converted back to Roman Catholicism in 1992.

In 2006 he earned a Ph.D. in religious studies from the Calamus International University, an unaccredited distance-learning institution incorporated in the Republic of Vanuatu.

After his conversion back to Roman Catholicism, Sungenis became known as a Traditionalist Catholic. He wrote Not by faith alone, a book of apologetics, explaining his view of the Catholic Church's doctrine of justification and his critique of the Protestant doctrine of salvation by faith alone.