 The Survey, formed after discussions at the Santa Cruz meeting on supernovae and the encouragement by Allan R. Sandage to use Type Ia supernovae to measure the Hubble constant H0 and the deceleration parameter q0, ran from 1990–95, and provided the pioneering method to measure precision distances to external galaxies, leading to a precise value of the Hubble constant.Continuing the work of the Calán/Tololo Survey, Suntzeff with Brian P. Schmidt co-founded the High-Z Supernova Search Team in 1994 that used observations of extragalactic supernovae to discover the accelerating universe.This universal acceleration implies the existence of dark energy consistent with the cosmological constant of Albert Einstein's theory of General Relativity, and was voted the top science breakthrough of 1998 by "Science" magazine.