2014-present - Senior Researcher, Department of Mathematics and Mathematical Physics, Tomsk Polytechnic University, Russia

2003-present - Professor, Department of Mathematics, Universidade Federal de Juiz de Fora, Brasil

2001-2002 - Visiting Professor, Universidade Federal de Juiz de Fora, Brasil

2000-2001 - Visiting Professor, Universidade Federal de Rio de Janeiro, Brasil

1998-1999 – Visiting Professor, Universidade de Sao Paulo, Brasil

1989-1997 - Professor, Department of Mathematics and Mathematical Physics, Tomsk Polytechnic University, Russia