Background
Source: Wikipedia
Alexander Moszkowski (15 January 1851 – 26 September 1934) was a German satirist, writer and philosopher also of Polish-Jewish descent. He was the brother of the composer and pianist Moritz Moszkowski. He was a friend of many celebrities in Berlin, among them the theoretical physicist Albert Einstein, about whom he was the first to publish a book in the summer of 1920 and consequently popularize the theory of relativity.
