Earlier this year, Olivier Chapelle passed away aged 42, after an unexpected severe illness that he was diagnosed with only a year before. He is sorely missed by his family and his friends, many of which had known him not only as a kind and modest human being, but also as one of the very best machine learning researchers of his generation. We are holding a memorial session in Olivier’s honour, with contributions from some of these friends, including Olivier Bousquet, Andre Elisseeff, Minmin Chen, Dilan Görür, Isabelle Guyon, Bernhard Schölkopf, Keerthi Selvaraj, Vladimir Vapnik, Kilian Weinberger, and Jaston Weston.