The author is Professor at the mathematical departement of the University of Heidelberg. He is expert in the theory of automorphic forms of several variables. Besides many research papers, he published several books in the Springer publishing house about Siegel modular functions (available also in Japanese language), Hilbert modular functions, singular modular forms, two volumes about Complex Analysis (the first volume in joint work with Rolf Busam). These volumes are also available in German language. In joint work with Reinhardt Kiehl a book about the Weil conjectures appeared.