Adam Riess (born December 16, 1969) is an American astrophysicist, University Professor at Johns Hopkins University, and a researcher at the Space Telescope Science Institute. He is renowned for leading the High-z Supernova Search Team that discovered the accelerating expansion of the universe, for which he shared the 2011 Nobel Prize in Physics with Saul Perlmutter and Brian Schmidt. Riess's research focuses on cosmology, particularly using Type Ia supernovae to measure cosmic expansion history. His work revealed the existence of dark energy, fundamentally altering humanity's understanding of the universe's evolution. Riess has also received the Shaw Prize in Astronomy (2006) and the Gruber Cosmology Prize (2007), among other honors.
