Guido Altarelli, born on July 12, 1941 and died September 30, 2015, he was an Italian theoretical physicist.
Guido graduated in Physics from Rome University in 1963 with Raoul Gatto whom he followed to the University of Florence (1965 to 1968).
He held positions at New York University (1968 to 1969), the Rockefeller University (New York, 1969–1970), l’Ecole Normale Superieure in Paris (76-77, 81) and Boston University (85-86).
In 1970-92 Guido held a faculty position at the “La Sapienza” University in Rome (full professor of theoretical physics since 1980).
Guido was Director of the Rome Section of the INFN (1985–1987).
In 1992 he moved to the newly established University of Roma Tre.
In 1987-2006 Guido was a Senior Staff Physicist at the Theory Division of CERN, and was Theory Division Leader from 2000-04.
At CERN he had a leading role in the interpretation of SppS results, in the preparation of LEP and the LHC and in the theoretical analysis of the experimental results.
His best known contribution, obtained with Giorgio Parisi in 1977, is the derivation of the QCD evolution equations for parton densities, known as the Altarelli- Parisi or DGLAP equations.
Guido Altarelli died at age 74 on September 30, 2015.