V. G. Mazya is widely regarded as a truly outstanding mathematician, whose work spans 50 years and covers many areas of mathematical analysis. This volume contains a unique collection of papers contributed on the occasion of Mazya's 70th birthday by a distinguished group of experts of international stature in the fields of Harmonic Analysis, Partial Differential Equations, Function Theory, Spectral Analysis, and History of Mathematics, reflecting the state of the art in these areas, in which Mazya himself has made some of his most significant contributions.