Prof. Lutz Geldsetzer is Professor Emeritus of Philosophy at the Heinrich-Heine Universitaet in Duesseldorf, Germany, where he has taught since 1963 and where from 1971 to 2002 he directed the research department for general theory of science in the Institute of Philosophy. In 1970, he co-founded the internationally recognized Journal for General Philosophy of Science/Zeitschrift fuer allgemeine Wissenschaftstheorie which he co-edited until 2009. He has published books and articles on a wide range of philosophical topics, and edited several series of philosophical dictionaries, classics in various areas including hermeneutics, and specialized bibliographies. He has been a visiting professor at universities in the United States, the People's Republic of China, Italy, France and Germany. He studied Philosophy, Social Sciences, Law and Languages at the Johannes-Gutenberg Universitaet in Mainz, Germany, where he received his Ph.D. in 1961, and did postgraduate work at the Sorbonne in Paris in 1961-62.