**Research Interests**

Inverse problems in partial differential equations and related topics (potential theory, uniqueness of the continuation and Carleman estimates, nonlinear functional analysis and calculus of variations). I have a particular interest and results in the following inverse problems:

- Inverse problem of gravimetry (general uniqueness conditions and local solvability theorems) and related problems of imaging including prospecting active part of the brain and the source of noise of the aircraft from exterior measurements of electromagnetic and acoustical fields.

- Inverse problem of conductivity (uniqueness of discontinuous conductivity and numerical methods) and their applications to medical imaging and nondestructive testing of materials for cracks and inclusions.

- Inverse scattering problem (uniqueness and stability of penetrable and soft scatterers).

- Finding constitutional laws from experimental data (reconstructing nonlinear partial differential equation from all or some boundary data).

- Uniqueness of the continuation for hyperbolic equations and systems of mathematical physics. This is quite challenging and important (for optimal control and inverse problems) area, and a sophisticated mathematical techniques (including Carleman estimates, pseudo convexity, and microlocal analysis) is used here.

- The inverse option pricing problem. Recovery of volatility from current option prices. This fundamental inverse financial problem has links to inverse parabolic problems with final overdetermination. It is well-posed, but difficult due to nonlinearity.