Johann (John) Georg Hagen (March 6, 1847 – September 6, 1930) was an Austrian Jesuit priest and astronomer. After serving as Director of the Georgetown University Observatory he was called to Rome by Pope Pius X in 1906 to be the first Jesuit director of the new Vatican Observatory. Father Hagen was also the spiritual director of Maria Elizabeth Hesselblad (1870-1957), who was baptized by him on August 15, 1902 and eventually was canonized on June 5, 2016 by Pope Francis.
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