Dr. Massimo Stiavelli received his PhD at the Scuola Normale Superiore in Pisa (Italy) in 1986. He moved to the Space Telescope Science Institute in 1995. He led the James Webb Space Telescope (JWST) Mission Office at the Space Telescope Science Institute (STScI) from 2012 until 2024 including development, launch, commissioning and start of science. He was an instrument scientist for the Hubble Space Telescope's Wide Field and Planetary Camera 2 (WFPC2), and participated to the development of the Advanced Camera for Surveys (ACS) the Wide Field Camera 3 (WFC3) instruments on Hubble. His research interests include cosmology, formation and evolution of galaxies and central black holes. Dr. Stiavelli led the team that carried out the Hubble Ultra Deep Field survey and has extensive experience in all aspects of modern astronomical research, from theory and observations to instrument development. Dr. Stiavelli has published more than 150 papers receiving more than 17,000 citations and with an impact factor of 67. In 2018 he was elected a Fellow of the American Association for the Advancement of Sciences and in 2021 he was elected a Foreign Fellow of the Accademia Nazionale dei Lincei (the Italian premier National Science Academy).