Vitali Volodymyrovych Klitschko born 19 July 1971) is a Ukrainian politician and former professional boxer who serves as mayor of Kyiv and head of the Kyiv City State Administration, having held both offices since June 2014. Klitschko is a former leader of the Petro Poroshenko Bloc and a former Member of the Ukrainian Parliament. He became actively involved in Ukrainian politics in 2005 and combined this with his professional boxing career until his retirement from the sport in 2013. He holds a Doctoral Degree (Ph.D.) from Kyiv University's Physical Science Department.