Ulrich Muller. Born in 1940 in Bogota, Colombia. School attendance in Bogota, then in Elizabeth, New Jersey, and finally in Fellbach, Germany. Studied chemistry at the Technische Hochschule in Stuttgart, Germany, obtaining the degree of Diplom-Chemiker in 1963. Work on the doctoral thesis in inorganic chemistry was performed in Stuttgart and at Purdue University in West Lafayette, Indiana, in the research groups of K. Dehnicke and K. S. Vorres, respectively. The doctor's degree in natural sciences (Dr. rer. nat.) was awarded by the Technische Hochschule Stuttgart in 1966. Subsequent post-doctoral work in crystallography and crystal structure determinations was performed in the research group of H. Barnighausen at the Universitat Karlsruhe, Germany. Appointed in 1972 as professor of inorganic chemistry at the Philipps-Universitat Marburg, Germany, then from 1992 to 1999 at the Universitat Kassel, Germany, and since 1999 again in Marburg. Helped installing a graduate school of chemistry as visiting professor at the Universidad de Costa Rica from 1975 to 1977. Courses in spectroscopic methods were repeatedly given at different universities in Costa Rica, Brazil and Chile. Main areas of scientific interest: synthetic inorganic chemistry, crystallography and crystal structure systematics, crystallographic group theory. Co-author of Chemie, a textbook for beginners, Schwingungsspektroskopie, a textbook about the application of vibrational spectroscopy, and of Schwingungsfrequenzen I and II (tables of characteristic molecular vibrational frequencies); co-author and co-editor of International Tables for Crystallography, Vol. A1.