(1885–1944), Irish spiritual writer. A native of Co. Limerick, he entered the Congregation of the Holy Ghost and studied at Rockwell College and Rome. He was ordained priest in 1914, became dean of studies at Blackrock College in 1922, and its president in 1925. From 1939 he was superior of the house of his congregation at Kimmage. Leen was among the most popular RC spiritual authors. Among his best-known works are Progress through Mental Prayer (1935), containing practical instructions on the lower stages of mental prayer up to the Prayer of Quiet; The Holy Ghost (1936), considered esp. in His workings in souls; Why the Cross? (1938), meditations on the problem of pain; and The Church before Pilate (1939). He also wrote numerous pamphlets and articles on Catholic education.
From The Oxford Dictionary of the Christian Church in Oxford Reference.