Sergei Borisovich Ivanov (born 31 January 1953) is a Russian senior official and politician who is the Special Representative of the President of the Russian Federation on the Issues of Environmental Activities, Environment and Transport since 12 August 2016. Ivanov was Minister of Defense of Russia from March 2001 to February 2007, Deputy Prime Minister from November 2005 to February 2007, and the First Deputy Prime Minister from February 2007 to May 2008. After the election of Dmitry Medvedev as President of Russia, Ivanov was reappointed a Deputy Prime Minister in Vladimir Putin's second government.