Pugwash Conferences on Science and World Affairs
Calogero served as Secretary-General of Pugwash Conferences on Science and World Affairs from 1989 to 1997, and from 1997 to 2002 as chair of the Pugwash Council, of which he still is an "ex-officio" member. He published (in Italian and English---some with co-authors) nearly 400 papers and several books on world affairs.