In his position as Director Kreil followed by outstanding scientists, including Julius Hann (1839–1921) and Felix Maria von Exner (1876–1930). Hanns was important in climatology and a worldwide began to be in his era as one, meteorologists Austrian school — Hann also wrote the Comprehensive Textbook of Meteorology (1901) talking about — that one remembers Exner as a great theorist and his work of Dynamic Meteorology (1925).