In 1992-2016 he was a senior staff member of the Constitutional Court of the Russian Federation.

From 2009 to 2015 he was a judge at the UN International Criminal Tribunals for Rwanda and a judge at the Appeals Chamber of the UN International Criminal Tribunals for Rwanda and for the former Yugoslavia.

He taught at the Hague Academy of International Law, Diplomatic Academy of the Russian Foreign Ministry and other higher education establishments in Russia and abroad.

Author of multiple publications in the field of international law, including on international law in constitutional jurisdiction.