Max M. Tilzer is Professor Emeritus of Aquatic Ecology at the University of Konstanz. He received his Ph.D. in Biology at the University of Vienna 1967. Until 1973 he worked at the University of Innsbruck within the International Biological Program, coordinated by UNESCO, on high-mountain lakes. From 1974 to 1976 he worked at the University of California at Davis on Lake Tahoe, a large, extremely clear and unproductive lake in the Sierra Nevada. In 1976 he became Professor of Limnology at the Technical University in Berlin, and in 1978 he was appointed Director of the Limnological Institute of the University of Konstanz. During this time he established and directed a multi-disciplinary research project at Lake Constance. He also conducted research in the Antarctic Ocean and the Red Sea. Between 1993 and 1997 he was Director of the Alfred Wegener Institute for Polar and Marine Research at Bremerhaven which also operates the “Polarstern” a large ice-going polar research vessel, and research stations in both polar regions. Since 2004 he is officially retired. He has a strong interest in global environmental problems and frequently is giving talks on related subjects.