Mark M. Phillips is an American astronomer who works on the observational studies of all classes of supernovae. He has worked on SN 1986G, SN 1987A,the Calán/Tololo Supernova Survey, the High-Z Supernova Search Team, and the Phillips relationship. This relationship has allowed the use of Type Ia supernovae as standard candles, leading to the precise measurements of the Hubble constant H0 and the deceleration parameter q0, the latter implying the existence of dark energy or a cosmological constant in the Universe.