My main area of research is observational cosmology and the use of Type Ia supernovae to measure distances in the universe. I am member of the Supernova Cosmology Project that discovered the accelerated expansion of the Universe and the associated ”dark energy”. I shared the 2007 Gruber Prize in Cosmology and the Breakthrough Prize in Fundamental Physics in 2014. Furthermore, our team leader, Saul Perlmutter, shared the 2011 Nobel Prize in Physics. I have also received the Gustafsson Prize in 2004.
In the past, I have also worked in experimental particle physics, searching for the Higgs boson at CERN and in the area of high-energy neutrino astrophysics using the AMANDA/IceCube telescope at South Pole.