Researcher, LIRMM CNRS and University of Montpellier, France, originally from Moscow (where I've studied in the Moscow State Lomonosov University, worked at Institure of Information Transmission Problems, taught in mathematical schools #91, #57, and Independent University of Moscow). Author of several textbooks in Russian and English for high school and undergraduate students. See https://www.lirmm.fr/~ashen or https://mccme.ru/shen