Bart Bok: Astronomer, educator and administrator. Ph.D., University of Groningen (1932). Harvard University, R.W. Willson Fellow in Astronomy (1927-1929), Professor of Astronomy (1933-1957), Associate Director of the Harvard Observatory (1946-1952); Director, Mount Stromlo Observatory, Professor of Astronomy, Australian National University (1957-1966); University of Arizona, Head of the Department of Astronomy, professor and professor emeritus (1966-1983). Research in galactic structure and dynamics, stellar and interstellar matter.

Guido M nch: Mexican astronomer and astrophysicist. M.S. Mathematics, National Autonomous University of Mexico (1943). Instructor to asssitant professor, astronomer at Yerkes Observatory, University of Chicago (1947-1951); professor, astronomer at Mount Wilson and Palomar observatories, California Institute of Technology (1951-); director, Max Planck Institute for Astronomy (1977-1991).