Research fields: Numerical treatment of the Earth's rotation parameters, theoretical studies of the orbital motion of the Moon and rotational dynamics of the Earth (tidal and rotational deformations, planetary effects in precession-nutation, atmospheric excitation of polar motion and velocity of rotation), combination of Earth orientation parameters measured by astrometric and modern space techniques, ephemeris astronomy. 1962 graduated in Geodesy and Geodetic Astronomy from the Faculty of Civil Engineering of the Czech Technical University, Prague. 1973 PhD in Geodetic Astronomy. Since 1977 at the Astronomical Institute. 1983 three-month mission to the Bureau International de l'Heure in Paris. 1985 DSc in Astronomy. 1989 three-month mission to the U.S. Naval Observatory, Washington D.C. (Dept. Of Time Service and Earth Orientation). 1991-1994 Head of the Dept. Of Dynamics of Solar System; 1991-1992 six-month mission to the CNRS URA1125, Observatoire de Paris. 1998-2004 Chairman of the Czech National Committee for Astronomy of the IAU. Since 2000 Deputy Director of the Astronomical Institute for Foreign Contacts. 2001-2004 Chairman of the Directing Board of the IERS. Since 2003 Vice-President of IAU Division I (Fundamental Astronomy).