Guido Altarelli passed away on September 30th, the TH group bid farewell him:

"Many memories rush to mind, as tears to our eyes.
His ironic humour, his warmth, his kindness, his integrity,
his magnificent smile.  A pillar of our group is gone.

His great contributions to physics will be a lasting
tribute to his memory.  Guido will live on in our hearts.
Today is a day of great sorrow for the Theory Division."

Guido was a true giant of particle physics and of CERN. His contributions to physics span all subjects, from strong to electroweak interactions, from neutrinos to theories beyond the Standard Model, and from the study of precision measurements to the analysis of apparent anomalies, whose interpretation in terms of new physics he often exposed as naïve and unjustified. He left milestones in the progress of our field wherever he went. The awards of the Sakurai Prize in 2012 and of the EPS Prize in 2015 rank him among the greats, and reflect only in part the wealth of knowledge he gave to high-energy physics.

Guido Altarelli was not only a great scientist, but also a person of great integrity. He was always available to make the bridge between experiment and theory and to share his time and wisdom with the experiments and the wider laboratory. The scientific community has lost a great scientist and a great friend.

The Director-General has sent a letter of condolence to his family and a full obituary will follow in the CERN Courier.