(Chile, 1960) Winner of the 2015 National Prize for Exact Sciences. His main areas of scientific research are novas and supernovas, globular clusters, active galaxies and cosmology. He was the principle researcher on the Calán Tololo project between 1990 and 1993. This investigation was the one that led directly to the discovery in 1998 of the acceleration of the universe and the existence of a new component of dark energy that constitutes 70% of all energy in the universe. In 2011, the asteroid 109097 was named “Hamuy” in his honour. In 2016 he took up the position of president of the Chilean National Commission of Scientific and Technological Research (CONICYT).