Michel Voos passed away on Tuesday, August 23rd 2016 at the age of 76. Michel Voos was an experimental physicist, an internationally renowned specialist of semiconductors and nanostructures physics. He created and directed, from 1979, in the Physics Department at ENS, a team for research on nanostructures that is at the origin of the Laboratoire Pierre Aigrain (LPA), which he directed until 2000. His team was, in France, the first that studied quantum confinement in semiconductor nanostructures, one of the major topics in condensed matter fundamental as well as applied physics. From 2000 to 2005 he was appointed director of the Physics Department at ENS, where he still keeps an important aura. In parallel to his missions at ENS, Michel Voos was Chargé de mission for the general director of CNRS. In 2001, in was in charge of the creation of Laboratoire de Photonique et de Nanostructures (LPN), on the Alcatel campus in Marcoussis. This CNRS laboratory brought new possibilities in nanotechnologies for the whole French community. He has been member of the CNRS board of directors. In Ecole Polytechnique, Michel Voos was a very charismatic and appreciated professor from 1984 to 2005. He has been vice-président of the Physics Departement at Ecole Polytechnique from 2001 to 2004.