NA48 experiments at CERN). Also in 1976, he published two papers suggesting techniques for finding the gluon in annihilations. The following year he predicted the mass of the bottom quark on the basis of Grand Unified Theory, before this quark was observed in experiment. In 1978 he published a frequently cited general paper on such theories, with Andrzej J. Buras, Gaillard and Nanopoulos. In the 1980s, Ellis became a leading advocate of models of supersymmetry. In one of his earliest works, he showed that the lightest supersymmetric particle is a natural dark matter candidate. In 1991, he showed that radiative corrections to the mass of the lightest Higgs boson in minimal supersymmetric models increased that mass beyond the reach of the Large Electron–Positron Collider (LEP) searches. More generally, Ellis and collaborators pioneered the analysis of so-called "benchmark scenarios" meant to illustrate the range of phenomenology to be expected from supersymmetric models; such analyses have played a major role in evaluating the promise of various future accelerator options. In parallel to his investigations of supersymmetric phenomenology, Ellis has also advocated phenomenological probes of quantum gravity and string theory. These probes include direct tests of quantum mechanics with the CPLEAR Collaboration and the derivation of Grand Unified Theories from string theory. In this vein, his work on tests of the constancy of the velocity of light and models of string cosmology received separate prizes from the Gravity Research Foundation. An impression of the impact of Ellis' research can be obtained from the INSPIRE-HEP reference system for scientific papers in particle physics and related fields. As of 2015, this data base lists over 1,000 scientific papers of which he is an author; altogether the sum of citations is above 60,000. In 2004 a SPIRES survey ranked him as the second-most cited theoretical physicist. His publications include three papers with over 1000 citations, eight more with over 500 citations, and over 100 other papers with at least 100 citations each. With Daniele Amati, he edited the 2000 book Quantum Reflections (a collection of articles by various physicists on the philosophy and conceptualization of quantum theory). Support of particle accelerator projects In addition to his theoretical research, John Ellis has been an advocate and supporter of future accelerators, beginning with LEP and the LHC, and extending to Compact Linear Collider (CLIC), photon colliders, and future proton accelerators. Naturally his theoretical work reflected these connections, as