Rudolf Carnap and Hans Reichenbach can be considered as the most influential protagonists-in-exile of the scientific philosophy that arose in the twenties and early thirties under the headings Wissenschaftliche Weltauffassung and Wissenschaftliche Philosophie. Both were born in 1891 — as was a generally forgotten (and "most Viennese") member of the Vienna Circle: Edgar Zilsel (1891–1944).