Fr. Alois Gatterer S.J. (1886-1953) served at the Vatican Observatory from 1933 until his death in...

Fr. Johan Stein S.J. (1871-1951) served as Director of the Vatican Observatory from 1930 to 1951....

Fr. Patrick Treanor S.J. (1920-1978) served as Director of the Vatican Observatory from 1970 to...

Fr. Daniel O’Connell S.J. (1896-1982) served as Director of the Vatican Observatory from 1952 to...