Adam Guy Riess

Adam Guy Riess is an American astrophysicist and Bloomberg Distinguished Professor at Johns Hopkins University and the Space Telescope Science Institute. He is renowned for his groundbreaking research on the accelerating expansion of the universe, for which he shared the 2011 Nobel Prize in Physics with Saul Perlmutter and Brian Schmidt. Riess currently leads the SH0ES (Supernova, H₀, for the Equation of State of dark energy) team, which has produced increasingly precise measurements of the Hubble constant.

His educational background includes:

• Bachelor of Science from Massachusetts Institute of Technology (1992), where he was Phi Beta Kappa
• PhD from Harvard University (1996), supervised by Robert Kirshner and William H. Press

Riess's research focuses on using Type Ia supernovae as cosmological probes to measure the expansion history of the universe. His early work with the High-z Supernova Search Team provided the first evidence for cosmic acceleration, suggesting the existence of dark energy. More recently, he has been at the center of the scientific debate regarding the 'Hubble tension'—a discrepancy between measurements of the universe's expansion rate using nearby supernovae and measurements inferred from the cosmic microwave background radiation. His work with the SH0ES team has achieved measurements of the Hubble constant approaching 1% precision.

Analysis of Riess's publication record reveals a consistent focus on observational cosmology using supernovae as standard candles. His work has evolved from the initial discovery of accelerating expansion to increasingly precise measurements of cosmological parameters. Recent publications center on resolving the Hubble tension, with sophisticated analyses of Cepheid variables and Type Ia supernovae to refine local measurements of the Hubble constant. His research bridges observational astronomy, statistical analysis, and theoretical cosmology.

Among his numerous scientific honors are:

• Nobel Prize in Physics (2011)
• Shaw Prize in Astronomy (2006)
• Breakthrough Prize in Fundamental Physics (2015)
• Albert Einstein Medal (2011)
• MacArthur Fellowship (2008)
• Gruber Cosmology Prize (2007)

Riess has received substantial research funding supporting his work on cosmic expansion measurements. As a Bloomberg Distinguished Professor at Johns Hopkins University since 2016, he leads a research group focused on precision cosmology. He has mentored numerous students and postdoctoral researchers, though specific names aren't detailed in the source material. His work with the SH0ES team involves collaboration between Johns Hopkins University, the Space Telescope Science Institute, and other institutions worldwide.

Riess leads the SH0ES collaboration, which utilizes the Hubble Space Telescope to measure the local value of the Hubble constant with unprecedented precision. The team combines observations of Cepheid variable stars and Type Ia supernovae to construct a cosmic distance ladder. Their work represents one of the most precise local measurements of cosmic expansion and continues to challenge our understanding of fundamental cosmology through the persistent Hubble tension.