Nikolay Dimitrievich Zelinsky (Зелинский, Николай Дмитриевич in Russian) (February 6 n.s., 1861, Tiraspol, the largest city of Transnistria - July 31, 1953, Moscow), Russian chemist, academician of the Academy of Sciences of USSR (1929). Zelinsky studied at the University of Odessa and at the universities of Leipzig and Göttingen in Germany. Zelinsky was one of the founders of theory on organic catalysis. He is the inventor of the first effective filtering activated charcoal gas mask in the world (1915). The crater Zelinskiy on the Moon is named in his honor.