He is the coauthor of 6 chapters in important monographies, editor of two volumes of High Pressure in Semiconductor Physics in the Series of Semiconductors and Semimetals, Vol. 54 and Vol 55, eds. T. Suski and W. Paul (Academic Press). He was and currently is a member of advisory committees of several international conferences (e.g., International Conference on Nitride Semiconductors, Int. Symposium on Blue Light Emitting Diodes, Int. Conference on High Pressure in Semiconductor Physics and many other). His scientific interest concerns fundamental aspects of semiconductors, in particular their band structure, lattice vibrations, defects and phase transitions. Use of different pressures techniques in studies of semiconductors makes him one of the main world specialist in that area. During last 12 years he has been involved in studies of Group-III nitrides consisting of their basic properties and optoelectronic applications.