Vitali Volodymyrovych Klychko (Ukrainian: Віта́лій Володи́мирович Кличко́, [ʋiˈtɑʎiɪ̯ klɪtʃˈkɔ]; English: /vɨˈtæli ˈklɪtʃkoʊ/, German: Vitali Klitschko; born 19 July 1971) is a Ukrainian professional boxer and the reigning WBC Heavyweight Champion. He is a leader of the political party UDAR of Vitaliy Klychko and a member of the Ukrainian delegation to the Congress of the Council of Europe. He previously held the WBO and WBC titles. Klitschko is the first professional boxing world champion to hold a Ph.D. degree.
Klitschko is known for his powerful punches and durable chin. With a 86.96% knockout percentage rate, he holds the second best knockout-to-fight ratio of any champion in heavyweight boxing history, after Rocky Marciano's 87.76%. He has never been knocked down in any professional boxing bout and has also never lost a decision. His two losses have come via a shoulder injury during a fight and a deep cut above his eye, which were recorded as TKO losses. His power and his possession of a Ph.D has led to his nickname, Dr. Ironfist.