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This volume covers one of the most thrilling two-year periods intwentieth-century physics, as matrix mechanics - developed chiefly by W.Heisenberg, M. Born, and P. Jordan - and wave mechanics - developed by E.Schr\"odinger - supplanted the earlier quantum theory. The almost one hundredwritings by Einstein, of which a third have never been published, and the morethan thirteen hundred letters show Einstein's immense productivity and hecticpace of life.  Einstein quickly grasps the conceptual peculiarities involved in the newquantum mechanics, such as the difference between Schr\"odinger's wave functionand a field defined in spacetime, or the emerging statistical interpretation ofboth matrix and wave mechanics. Inspired by correspondence with G. Y. Rainich,he investigates with Jakob Grommer the problem of motion in general relativity,hoping for a hint at a new avenue to unified field theory.  Einstein falls victim to scientific fraud when, in a collaboration with E.Rupp, he becomes convinced that the latter's experiments, aimed at decidingwhether excited atoms emit light instantaneously (in quanta) or in a finitetime (in waves), confirm a wave-theoretic explanation.  While it was known that the teenage Einstein had been romantically involvedwith Marie Winteler in 1895, newly discovered documents reveal that his lovefor Marie was rekindled in 1909-10 while he was still married to MilevaMari\'c.  The 1925 Locarno Treaties renew Einstein's optimism in Europeanreconciliation. He backs the `International manifesto against compulsorymilitary service' and continues his participation in the League of Nations'International Committee on Intellectual Cooperation. He remains intenselycommitted to the shaping of the Hebrew University in Jerusalem, although hisenthusiasm for this cause is sorely tested.

Introduction to Volume 15 of The Collected Papers of Albert Einstein. The Berlin Years: Writings and Correspondence June 1925 - May 1927