Professor of Astrophysics, University of Sydney

Professor Geraint Lewis undertakes a broad spectrum of research. On the largest scales, his program involves looking at the influence of dark energy and dark matter on the evolution and ultimate fate of the Universe.

Another aspect of his research uses the phenomenon of gravitational lensing to probe the nature and distribution of the pervasive dark matter, and employing individual stars to magnify the hearts of quasars, the most luminous objects in the Universe.

Closer to home, Geraint's research focuses upon Galactic cannibalism, where small dwarf galaxies are torn apart by the much more massive Milky Way and Andromeda Galaxy. Using telescopes from around the world, including the 10-m Keck telescope in Hawaii, he has mapped the tell-tale signs of tidal disruption and destruction, providing important clues to how large galaxies have grown over time.

Geraint also writes a blog, Cosmic Horizons, at:


  • 2002–present
    Professor of Astrophysics, University of Sydney
  • 1997–1999
    Postdoctoral Researcher, University of VIctoria, BC, Canada
  • 1996–1997
    Postdoctoral Researcher, University of Cambridge


  • 2003 
    The University of Sydney, Graduate Certificate of Higher Education
  • 1995 
    Institute of Astronomy, University of Cambridge, PhD in Astronomy
  • 1990 
    Queen Mary College, University of London, BSc (Hons) in Physics & Astronomy

Research Areas

  • Cosmology And Extragalactic Astronomy (020103)
  • Galactic Astronomy (020104)
  • Physical Sciences (02)
  • Classical Physics (0203)
  • Astronomical And Space Sciences (0201)


ARC Future Fellow (2011-2014)