"Frederick Eckstein (February 17, 1861 in Perchtoldsdorf, Lower Austria – November 10, 1939 in Vienna) was an Austrian polymath, theosophist and a friend and temporary co-worker of Sigmund Freud. Emil Molt states: ´He was the benefactor of Bruckner and Hugo Wolf, indeed the right arm of Bruckner, taking care that affairs went smoothly. He was a world traveller, had mastered Jui-jitsu and taught himself all sorts of difficult tricks. The story went around that he had trained himself to jump off a fast moving train without getting hurt. He too, was a highly gifted mathematician and a learned man in many respects.´" - (en.wikipedia.org 29.08.2020)
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