Mario Livio is an Israeli-American astrophysicist and an author of works that popularize science and mathematics.  From 1991 to 2015, he was an astrophysicist at the Space Telescope Science Institute, which operates the Hubble Space Telescope. His 2002 book The Golden Ratio: The Story of Phi, the World's Most Astonishing Number, won the Peano Prize and the International Pythagoras Prize for popular books on mathematics. 

Livio was a professor of physics at the Technion – Israel Institute of Technology from 1981 to 1991. In 2000, he did extensive research on supernova explosions and their use in determining the rate of expansion of the universe. He has also studied so-called dark energy, black holes, and the formation of planetary systems around young stars. He has a Bachelor’s in Physics and Mathematics from the Hebrew University of Jerusalem, a Master’s degree in Theoretical Particle Physics from the Weizmann Institute, and a Ph.D. in Theoretical Astrophysics from Tel Aviv University. He was born in Bucharest.