Baade (bah-de), born the son of a schoolteacher in Schröttinghausen, Germany, was educated at the universities of Münster and Göttingen, where he obtained his PhD in 1919. He worked at the University of Hamburg’s Bergedorf Observatory from 1919 to 1931, when he moved to America. He spent the rest of his career at the Mount Wilson and Palomar Observatories, retiring in 1958.