M. A. Leontovich's researches in electrodynamics

A brief review is given of the principal results achieved by M. A. Leontovich in electrodynamics. Among them are approximate boundary conditions on the surface of a good conductor, the parabolic equation method for solving diffraction problems, the theory of thin antennas, the inertial theory of constriction of a powerful pulsed discharge, conditions for suppressing the kink instability of a current-carrying conductor, and other results.