Vladimir Klitschko.
The previous one was his brother Vitali before his last retirement.
Prior to that, it was Lennox Lewis, who won it from Shannon Briggs, who took it from George Foreman, who took it from Michael Moorer, who took it from Evander Holyfield.
Hope this helps.
Vitali Klitschko of the Ukraine has been the World Boxing Council heavyweight champion since October 2008.
Vladimir Klitschko is the IBF, WBO, WBA and IBO champion Vitali Klitschko is the WBC champion
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Vladimir Klitschko is a Ukrainian heavyweight professional boxer. He is the longest reigning IBF, IBO & WBO heavyweight champion in the history of boxing. He is a younger brother to Vitali Klitschko who was the former WBC, WBO & Ring magazine heavyweight champion.
David Haye, he took it from Nikolay Valuev in November, 2009.
Mohamed Ali
Muhammad ali
Rocky Marciano
Not at this time.
It is Mike Tyson when he was fighting with Trevor Berbick He became the youngest heavyweight champion in history.
Rocky Marciano is the only heavyweight champion not to loose a fight.
geroge forman