Director of Belgrade Astronomical Observatory1994-2002. Editor in Chief of ''Serbian Astronomical Journal'' 1987-2002, President of Astronomical Society ''Rudjer Boskovic'' 1982-2004, Editor in Chief of the journal „Vasiona (Universe)“ 1985-2004, President of the Society of Astronomers of Serbia 2008-2014. Federal Minister for Science, Technology and Development 1993-94. Since 2009, Affiliated Fellow of the Paris Observatory - LERMA. Member of the Association of Writers of Serbia (2008).