Wladimir Klitschko aka Dr. Steelhammer (Ukrainian: Володи́мир Володи́мирович Кличко́; Volodymyr Volodymyrovych Klychko; is a Ukrainian professional boxer. He is a former world heavyweight champion of three major sanctioning bodies, having held the titles of the WBA, IBF, and WBO (twice); additionally he has held the IBO, Ring magazine, and lineal heavyweight titles. A strategic and cerebral boxer, Klitschko is considered to be one of the greatest heavyweight champions of all time, as well as among the hardest punching knockout artists in the history of the division; his strong jab, straight right hand and left hook being his most formidable weapons