On the broad Boulevard of Unter den Linden, behind the bronze statue of Friedrich the Great (1712–1786), King of Prussia, and adjacent to the University of Berlin, there was a row of old buildings under the shadow of linden trees, where the Prussian Academy of Science was located. On a morning of April of 1914, Einstein came to this building which looked and smelled centuries old. From that day on, this youngest member of the Academy would quietly step into his office, lost in rumination over the new approach to deal with the old problem of gravity. He also worked at the nearby university. As his third post—the founding director of the Kaiser Wilhelm Institute (KWI) for Physics—was concerned, the Institute was still being planned. Einstein was given an office by Director Fritz Haber (1868–1936) in his KWI for Physical and Electrochemistry. Einstein was not interested in leading a large group of physicists to engage in cutting edge research, and neither had he any talent or experience in administration. He resigned the directorship later, and asked von Laue to take over (Fig. 7.1).