when he showed that data from the Stanford Linear Collider (SLC) and from LEP could be used to predict the masses of the top quark and the Higgs boson. Such predictions are now a mainstream activity within particle physics, and constitute one of the most important bridges between the experimental and theoretical communities. Concerning the LHC, Ellis played a leading role in the seminal 1984 workshop on physics to be done with such an accelerator. Since then he has written many articles on searches for Higgs bosons and supersymmetric particles at the LHC, both for the particle physics community and at a more popular level. His most recent LHC physics review appeared in a Nature Insight supplement on 19 July 2007. John Ellis has been a strong supporter of the CLIC option for a future high-energy linear collider; this option is pursued most strongly at CERN. He was convenor of the CLIC Physics Study Group that produced the main report on this option, in 2004. Awards and honours In June 2020 Ellis was appointed an honorary fellow of the Institute of Physics (IoP) for his “outstanding work in theoretical particle physics and cosmology, his encouragement and support of countries across the world to work with CERN and his outreach work inspiring the public.” Outreach and spreading physics around the world Ellis is regularly invited to give public lectures on particle physics and related topics. In the two-year period 2004–5, he gave public lectures in Geneva (in French), in Granada and Barcelona (in Spanish), in Rome (in Italian) and in Warsaw (in English). He recently gave a speech about the future of Physics beyond the Higgs boson in València (in English). While at CERN he often gives introductory talks to visitors, ranging from official delegations from the United Kingdom to physics teachers at the high-school level. Ellis is known for his efforts to involve non-European nations in CERN scientific activities. In the context of the LHC, he has interacted frequently with physicists, administrators at universities and institutes, and ministers of funding agencies and diplomatic corps from a wide variety of countries, ranging from major CERN partners like the United States, Russia, Japan, Canada, India, Israel, Armenia and China, to states with nascent physics programs such as Azerbaijan, the Baltic republics, Bolivia, Colombia, Croatia, Cyprus, Iran, Madagascar, New Zealand, Pakistan, Romania, Sri Lanka, Vietnam, and lately in Palestine and Rwanda, and many