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Otto Forster.
He is the most brilliant expositor I have ever met. I cherish the notes I took a long time ago of courses he gave in Italy and France, in perfect Italian and French. He wrote a wonderful course on Analysis (in three volumes) which has been the reference in German Universities for 30 years, something like Rudin in the States. His book on Riemann surfaces (both compact and non compact) is a masterful blend of Algebra, Topology and Analysis, with tools ranging from cohomology of sheaves to difficult potential theory. He is a brilliant researcher and has made important contributions to complex geometry and also to algebra (Forster-Swan). Working with him was a wonderful experience and he had the generosity of letting me co-sign articles to which my contribution was negligible compared to his. I am very happy of this opportunity to express my gratitude to and admiration for this genuine scholar and real gentleman.