Klitschko brothers 5 months & 13 days. Vitali retained the WBC Heavyweight Championship until 15 December 2013, relinquishing his belt in pursuit of his political aspirations in his native Ukraine. The Klitschko brothers jointly run the professional boxing promotion companies ""K2 Promotions"" and ""K2 East Promotions"", as well as the ""Klitschko Brothers Fund"", a charity organization. They appear together on German TV shows and commercials, have a website shared between them, and support each other's training and fights. After Vitali's retirement, Wladimir continued to reign as champion & successfully defend all remaining title belts except for the WBC belt. He eventually lost
Vitali Klitschko Foreman are the only heavyweight boxers in history to defend a world title after turning 40. Being the first professional boxing world champion to hold a PhD degree, and in reference to his punching power, Klitschko's nickname was "Dr. Ironfist". His younger brother, Wladimir, is a former unified world heavyweight champion. From 2006 until 2015, Vitali and Wladimir dominated heavyweight boxing, a period typically known as the "Klitschko Era" of the division. Klitschko formally began his political career in 2006 when he placed second in the Kiev mayoral race. In 2010, he founded the party Ukrainian Democratic Alliance for Reform