Chairman of the Scientific Committee of the 21st (Portland, USA, 2000), 22nd (Santiago, Chile, 2004) e 23rd (Beijing, China, 2008) Sessions of the International Poplar Commission (FAO);
Presidente del Comitato scientifico della 21.ma (Portland, USA, 2000), 22.ma (Santiago, Cile, 2004) e 23.ma (Beijing, Cina, 2008) Sessione della International Poplar Commission (FAO);