In 1959–62, he was a graduate student of the Institute of Physics and Mathematics of the Lithuanian Academy of Sciences.
In 1990–2003, he was the head of the Astronomical Observatory of the Institute of Theoretical Physics and Astronomy of Vilnius University.
In 1992–93 academic year: visiting professor in Union College, Schenectady, New York.
Main directions of the scientific research: multicolor photometry of stars, stellar physical parameters, stellar classification, interstellar extinction, interstellar clouds, star clusters, Galactic structure.
He was author of 324 scientific papers published between 1957 and 2009 and of three monographs: Multicolor Stellar Photometry (Vilnius, 1977, in Russian), Metal-Deficient Stars (Vilnius, 1982, in Russian) and Multicolor Stellar Photometry (Tucson, Arizona, 1992 and 1995, revised version, in English).