Count Renaud de la Frégeolière (1886–1981) of France; served 1923–1960 Almicare Rotta (1911–1981) of Italy; served 1960–1980 Klaus Kotter (1934–2010) from West Germany/Germany; served 1980–1994 Robert H. Storey (born 1942) from Canada; served 1994–2010 Ivo Ferriani (born 1960) from Italy; served since 2010