This volume presents complex analysis in one variable in the context of modern mathematics, with connections to several complex variables, de Rham theory, real analysis, and other branches of mathematics. Covering spaces are used in dealing with Cauchy's theorem, real variable methods are illustrated in the Loman-Menchoff theorem and in the corona theorem, and the algebraic structure of the ring of holomorphic functions on a domain in C is studied. The book illustrates mathematical ideas and tools. Cohomological methods are introduced, in connection with the existence of primatives and in the study of meromorphic funtion as on a compact Riemann surface. This second edition has exercises, problems and examples for students, so they can consolidate their command of complex analysis and its relations to other branches of mathematics.