From 1989 to 1990 he was Senior Researcher at the Department of Functional Analysis in the Keldysh Institute of Applied Mathematics in Moscow.
[1] Since 2019 his is a member and first chairperson of the Russian Academy of Science's Commission against falsification of scientific research.
He is vice-chief editor of the Journal Functional Analysis and its Applications, and the president of the Moscow Mathematical Society.
On 21 February 2014 he together with other protesters against Bolotnaya Square case was arrested near Zamoskvoretsky Court in Moscow.
[3] On 5 March 2014 he among the other protesters was sentenced by Zamoskvoretsky Court to 10 thousand roubles (~ $150 US) fine for "resisting police".