Guglielmo Ventura was professor of Cryogenics and Vacuum Technologies at the University of Florence until he retired in 2013. He is now a cryogenic consultant for INFN, Rome, in the European project LUCIFER. He has collaborated in space, rocket and balloon born experiments (measurement of the Cosmic Background Radiation or CBR) and is now involved in CUORE (Cryogenic Underground Observatory for Rare Events) underground experiments.