Sergei Mitrokhin was born in 1963. Academically, he was a candidate of political science. He is now married, with a daughter.
From 1987 – 1991 he participated in informal movements and was one of the founders and authors of the independent newspaper Khronograph (Chronograph) From 1990 - 1995 Sergei was deputy head of the International Institute of Humanitarian and Political Research. He was also a member of the State Duma, the Yabloko faction, and deputy chair of the Local-Self Government Committee. He has prepared 82 laws of the Russian Federation on protection of human rights, state governing, housing and communal services sector, local self-governing, public movement and political parties, anti-corruption laws, as well as laws in the fields of national security and ecology.
From 1996 - 2000 Sergei Mitrokhin succeeded in persuading the government to annually allot several millions roubles for the Kurchatov Nuclear Institute for reconstruction of its infrastructure and improvement of security measures of this nuclear facility. In 2004 the government agreed that stage by stage evacuation of radioactive waste (preserved for 60 years at the Institute's grounds ) should be evacuated from the contaminated land.
From 2001 - 2008 Sergei was the deputy chair of the YABLOKO party. He participated in the development of the key programme documents of the party – the Democratic Manifesto and the Seven Steps Toward Equal Opportunities programme.
In 2002, Sergei initiated a movement against imports of nuclear waste into Russia. In 2003, the President of Russia appointed him member of the Commission for Control Over Nuclear Waste Imports into Russia. He organised public inspection of the largest nuclear facility in Russia (in the Krasnoyarsk region). This campaign resulted in considerable improvement of security measures at the facility.
During 2005 – 2009, Sergei was elected deputy of the Moscow City Duma, head of the Yabloko faction. He is engaged in the protection of human rights, ecology, enhancing of parliamentarycontrol over the Moscow Government and the Moscow budget expenditures, solution of the problems of the housing and communal services sector, and the fight for the preservation of Moscow's historic sites.
In 2008, Sergei Mitrokhin was elected Chairman of the Russian United Democratic Party YABLOKO