Born in Maitland, New South Wales, he became the first Australian to be awarded the Licentiate of the Trinity College of Music, London (LTCL) and the Fellowship of the Trinity College of Music London (FTCL), in 1974 and 1977 respectively.
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Ongley's first transcription for solo guitar was published in 1973 by J. Albert and Son, an interpretation of Ludwig van Beethoven's Für Elise.
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In 1993 Ongley collaborated with British trumpeter Steve Waterman and bass player Laurence Cottle, to release his first jazz record, "Song for Ros", recorded at Abbey Road Studios on 24 April 1993.
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In 1979 Ongley performed for the Australian High Commissioner, Gordon Freeth, at Australia House, London, playing the piece "Cello Suite No.1" by Johann Sebastian Bach.
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