Career
He founded the publications Grič, Kritika and Savremenik. Wiesner was also active musically, and played gusle. Wiesner translated foreign poetry into Croatian, including works by Walt Whitman.
He was an editor of Mate Ujević"s Croatian Encyclopedia.
During World World War II he worked on the Berlin-based Suradnja. From 1948, until his death he lived in Rome at the Pontifical Croatian College of Saint Jerome, where he organized the Vatican"s radio program in Croatian.