 Co-editor of International Journal of Modern Physics D (World Scientific, 2000-2010), of The European Physical Journal Plus (Springer) and of book series 'Advances in Astronomy and Astrophysics' (Taylor & Francis, UK).Fellow of the Royal Astronomical Society (UK).Speaker at XXII Solvay conference on physics, keynote speaker at IXth Swiss Biennial on Science, Technics + Aesthetics on “The Large, The Small and the Human Mind”, lecturer at Xth Brazilian School of Cosmology and Gravitation.