Nikolai Sergeyevich Valuev is a Russian politician and former professional boxer. He competed in boxing from 1993 to 2009, and held the World Boxing Association (WBA) heavyweight title twice between 2005 and 2009. Standing at a height of 2.13 metres and a peak weight of 151 kilograms, Valuev is best known for being the tallest and heaviest world champion in boxing history.