Research fields: Dynamical astronomy, chaos, resonances, structure of the asteroid and Kuiper belts, stability of orbits, multiple exoplanetary systems. 1970 graduated with honors in Theoretical Physics from Charles University, Prague. Since 1970 at the Astronomical Institute, presently in Group of Planetary Systems. 1994-1996 Deputy Director for Foreign Contacts, 2000-2004 Head of the Department of Dynamical Astronomy. Since 2000 member of organizing committee of IAU Commission 7 (Celestial Mechanics).