Ben Koeleman is founder of the social network YAYANGO. He studied mathematics and german literature in Karlsruhe (KIT) an Berlin (FU). In his german lessons at a french grammar-school Ben made use of dutch teaching materials, what he liked more. In diverse industries he developed databases and user programs. Ben is the inventor of the wold-wide first translating-community "Harry-auf-Deutsch.de". Ben lives in Berlin and has two children.