His distinguish thesis work was written in 1974/75 in the Moscow State University under supervision of Professors Mark Vishik and Alexander Shnirelman [de] on topological methods in nonlinear analysis.

His PhD thesis was written in the Moscow State University 1975/76–1978/79 on a global solvability of nonlinear Riemann–Hilbert problems which was defended in 1980.

His habilitation thesis was titled "Geometrical properties of nonlinear mapping related to pseudodifferential operators and their topological degree" and was defended in 1998 in the Free University Berlin.

In all areas mentioned above he has obtained significant results which are reflected in his invitations to many international conferences as a keynote speaker.

It is worth noting that, in USA and Canada such prestigious titles and positions are as a rule awarded to nominated Nobel Laureates and Fields Medalists.