This book is a collection of papers reflecting the conference held in Caracas, Venezuela, in January 1994 in celebration of Professor Mischa Cotlar’s eightieth birthday. Presenting an excellent account of recent advances in harmonic analysis and operator theory and their applications, many of the contributors are world leaders in their fields. The collection covers a broad spectrum of topics, including: wavelet analysis Haenkel operators multimeasure theory the boundary behavior of the Bergman kernel interpolation theory Cotlar’s Lemma on almost orthogonality in the context of $L^p$ spaces and more … The range of topics in this volume promotes cross-pollination among the various fields covered. Such variety makes Harmonic Analysis and Operator Theory an inspiration for graduate students interested in this area of study.