John Antoniou, studied at the Sydney Conservatorium and began his professional singing career with the Australian Opera in 1981. Before this John was regularly involved in amateur productions and made his Operatic debut as "Nick Shadow" in Stravinsky's "The Rake's Progress". His early roles with The Australian Opera included, Schaunard and Marcello in "La Boheme", Gregorio in "Romeo et Juliette" and Masetto in "Don Giovanni".
After winning the Sydney Sun Aria in 1982 and two other scholarships, John studied singing in Paris in 1984 and 1986. Between 1987 and 1991, John was engaged as a soloist with the Vienna State Opera, singing roles such as, Bretigny in "Manon", Biterolf in "Tannhauser" and Kruscina in "The Bartered Bride".
Upon returning to Australia in 1991, John once again was engaged with Opera Australia, singing regularly until 2003. Roles included, Zurga in "The Pearlﬁshers", Alﬁo in "Cavalleria Rusticana", Valentin in "Faust" and Pruss in "The Makropulos Secret". Since then John has worked Australia wide as a free lance artist and also in New Zealand, Singapore and Japan. John's concert repertoire includes solos in Carmina Burana, Brahms' Requiem, Faure Requiem, St John Passion, The Bells (Rachmaninov), Bach's B Minor Mass and Handel's Messiah."