He held positions including CEO and artistic director of the Royal Swedish Opera in Stockholm, as well as president of the International Federation for Choral Music.
[6][7] In 1968-78 Hemberg wrote Messa d'oggi , a choral piece with texts by Quasimodo and Dag Hammarskjöld.
Furthermore, in 1970 he wrote a choreographic choral suite, which Hemberg described as "an opera in four acts" based on poems by Robert Graves.
[10] During his time he put up many notable performances including Ingmar Bergman directing The Bacchae by Daniel Börtz, in 1991.
[citation needed] He was the president of the International Music Council of UNESCO, as well as chairman of the International Federation for Choral Music (IFCM),[12] and in 2000 he was made The Bud Pearsson Distinguished Professor in Swedish Studies at the Bethany College, Lindsborg, Kansas, USA.