A Giant of particle physics

Guido Altarelli is a giant of particle physics, and I use the present tense advisedly, as his outstanding contributions to the discipline make his marks everlasting and as relevant today as ever. The breadth and depth of his scientific output are evidenced by the range of topics covered by the many distinguished physicists writing in this volume. From my vast repertoire is indeed a fitting title, since Guido’s work ranged from QCD to deep inelastic scattering and neutrino physics, and from HERA to LEP, the LHC and beyond. There were very few areas of particle physics that did not interest him, or to which he did not contribute.