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a Dutch mathematician and computer scientist, former lecturer at [https://en.wikipedia.org/wiki/HU_University_of_Applied_Sciences_Utrecht Utrecht University of Applied Sciences] (Hogeschool Utrecht), and as computer chess programmer author of the chess engine [[Queen (engine)|Queen]], and based on Queen, the [[Android]] app [[Senior Chess]] <ref>[http://home.planet.nl/~ammeraal/chess.html Leen Ammeraal - Queen]</ref> . Leen is also author and co-author of various programming books about [[Cpp|C++]], [[Java]] and [[Graphics Programming|Computer Graphics]].