[en] Research has been performed on several topics on linear and nonlinear instabilities, primarily in geometries of interest to present and future magnetic fusion devices. The emphasis of the nonlinear studies has been on the dissipative trapped electron and drift cyclotron loss cone instabilities. The results of the former study are in good agreement with the experimental data in a linear mirror geometry. The latter studies are intended to provide predictions which can be checked by experiments on 2X PI B. The two mode bump-on-tail problem has also been solved. The thrust of the linear program has been toward understanding radial eigenvalue problems appropriate to trapped electron and collisionless drift instabilities in tokamaks. Investigations of tearing effects due to drift instabilities are also underway. In addition, the gyro-kinetic formulation has been generalized from the linearized to the full Vlasov operator