 His other productions include Puccini's "Madama Butterfly" in Jefferson, Louisiana, US, in 1999; and "La Traviata" in Mississauga (Canada) in 2002.1996-1999 Sober was artistic director of the National Opera house Ivan pl.Zajc in Rijeka
1997-1998 was a general manager of the National Theater in Rijeka as well.