in major astronomical journals that deal principally with supernova explosions and the application of supernovae to cosmology. His work has been cited over 57,000 times, and his h-index is 108. Kirshner was a member of the High-Z Supernova Search Team that used observations of distant supernovae to discover the accelerating universe. This universal acceleration implies the existence of dark energy and was named the breakthrough of 1998 by Science magazine. For this work, he also shared in the 2007 Gruber Cosmology Prize. Brian Schmidt and Adam Riess, both of whom were among Kirshner's nineteen Ph.D students, shared in the 2011 Nobel Prize in Physics for the same discovery. His account of this discovery is described in The Extravagant Universe : Exploding Stars, Dark Energy, and the Accelerating Cosmos (2002; ) which has been translated into Japanese, Chinese, Spanish, Portuguese and Czech. He has been a member of the National Academy of Sciences since 1998, the American Academy of Arts and Sciences since 1992 and the American Philosophical Society since 2005. He was the President of the American Astronomical Society from 2004–2006. Recognition In 2004, he received the Caltech Distinguished Alumni Award. In 2010, he received an honorary Doctor of Science from the University of Chicago. In 2011, he won the Dannie Heineman Prize for Astrophysics from the American Institute of Physics. In 2012, he won a Guggenheim Fellowship. In 2014, he won the James Craig Watson Medal for service to astronomy from the National Academy of Sciences and shared in the Breakthrough Prize in Fundamental Physics with the High-Z Team. In 2015, he shared the Wolf Prize in Physics with B.J. Bjorken. In 2019, he received an honorary Doctor of Science from Ohio University. He is a popular writer and speaker both in the United States and internationally, and is represented by Jodi Soloman Speakers. He has been frequently interviewed by both mainstream journalists and the science press and is often quoted in the New York Times, the Washington Post, Nature, and Science magazine. He has written for the general public in National Geographic, Sky & Telescope, Natural History, and Scientific American. Kirshner's service to science includes board memberships for the Gemini International Telescope, the AUI Board for the National Radio Astronomy Observatory, the Associated Universities for Research in Astronomy, the National Research Council Committee on Astronomy and Astrophysics, the NASA Advisory Committee Science Subcommittee, and the Math and Physical