The experiment consists of a collaboration of more than 400 scientists and engineers from around the world. The collaboration is led by a spokesperson, elected by members every three years, along with a team of deputies and other appointed members who oversee various aspects of operating the detector and managing the large group of scientist and institutions affiliated with it. Past and present spokespeople include Shoji Nagamiya (1992–1998), William Allen Zajc (1998–2006), and Barbara Jacak (2007–2012).