Although dark energy accounts for more than 70 percent of the energy of the universe, we know very little about it, so each clue is preciousHubble finds dark energy in young universe Nov 16, 2006
That was when the Universe stopped slowing down and began to accelerate, experiencing a cosmic jerkAge of universe discovered Oct 13, 2003
Adam Guy Riess (born 1969) is an astrophysicist at Johns Hopkins University and the Space Telescope Science Institute and is widely known for his research in using supernovae as Cosmological Probes.
Riess graduated from The Massachusetts Institute of Technology in 1992 where he was a member of the Phi Delta Theta fraternity. He received his PhD from Harvard University in 1996. Riess' PhD thesis was supervised by Robert Kirshner and resulted in measurements of over twenty new type Ia supernovae and a method to make Type Ia supernovae into accurate distance indicators by correcting for intervening dust and intrinsic inhomogeneities.
Riess was a Miller Fellow at the University of California, Berkeley before moving on to the Space Telescope Science Institute in 1999. He took up his current position at Johns Hopkins University in 2005.