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Sergei Konstantinovich Krikalev ( also transliterated as Sergei Krikalyov; born 27 August 1958) is a Russian mechanical engineer, former cosmonaut and former head of the Yuri Gagarin Cosmonaut Training Center. As a prominent rocket scientist, he is a veteran of six space flights and ranks fourth to Gennady Padalka, Oleg Kononenko and Yuri Malenchenko for the most time spent in space: a total of 803 days, 9 hours, and 39 minutes. Wikipedia