Johann Dvořák (religious name Clement Mary Hofbauer) was born on December 26, 1751 at Taßwitz in Moravia to a Bohemian peasant family. In 1785, at the age of 33, Clement Mary travelled to Rome and entered the Redemptorists — the Alphonsian Congregation of the Most Holy Redeemer founded by St. Alphonsus Liguori (see his existing entry).
In 1787, Clement Mary was sent to Warsaw as Redemptorist missionary — establishing the first Redemptorist community north of the Alps at Warsaw. For 21 years (1787–1808), Clement Mary served as rector of the Warsaw Redemptorist Community and superior of the Redemptorists in northern Europe.
In 1808, Napoleon's occupation of Warsaw suppressed the Warsaw Redemptorist community. Clement Mary travelled to Vienna where he served as pastor at the Church of Maria am Gestade for the 12 years (1808–1820).
Clement Mary became famous during his lifetime as the 'Apostle of Vienna' — undertaking the systematic Catholic pastoral ministry during the Habsburg-era Enlightenment-Josephinist religious skepticism. He died at Vienna on March 15, 1820 at the age of 68.
Canonized May 20, 1909 by Pope St. Pius X.