Geoffrey Marcy, born 1954 is the Professor of Astronomy, University of California, Berkeley and Adjunct Professor of Physics and Astronomy, San Francisco State University.

He graduated from UCLA, Summa Cum Laude, Phi Beta Kappa in 1976 with a B A (Double Major: Physics and Astronomy), and attained his PhD (Astronomy and Astrophysics) at the University of California Santa Cruz (1982).

He was the Carnegie Fellow, Carnegie Institution of Washington (1982 - 1984), the Associate-Full Professor of Physics and Astronomy, San Francisco State University (1984 - 1996); and Distinguished University Professor, San Francisco State University (1997 - 1999). He was elected as a member of the National Academy of Sciences in 2002.

Michel Mayor, born 1942 is currently Professor at the Department of Astronomy, University of Geneva, and since 1998 has been the Director of the Geneva Observatory.

Professor Mayor studied physics at Lausanne University (1966) and then attained his PhD at the Geneva University (1971). He has been research associate at the Geneva University (1971 - 1984) and the Professor of Astronomy since 1988.

He has taken part in and continues to contribute to the work of the international scientific community, at the European Southern Observatory (ESO, Chile) and at the Observatoire de Haute-Provence (CNRS, France), with stays at Cambridge Observatory (UK) in 1971 and at the University of Hawaii (1994 - 1995), undertaking work at the Presidency of the Commission on the galactic structure of the International Astronomical Union (IAU) (1988 - 1991), of the Scientific and Technical Committee of the European Southern Observatory (1990 - 1992) and of the Swiss Society of Astrophysics and Astronomy (1990 - 1993).

3 June 2005, Hong Kong