- He wrote the song, "Quiet Please, There's A Lady On Stage" as a tribute to his late mother-in-law, Judy Garland.
- The musical "A Boy From Oz" is based on his life, with music written by him. The title role was portrayed by Hugh Jackman.
- He is credited for part of the Arthur (1981) theme song, a movie that starred his ex-wife Liza Minnelli. The other songwriters included Christopher Cross and Carole Bayer Sager.
- He was awarded the A.M. (Member of the Order of Australia) in the 1990 Queen's Birthday Honours List for his services to the performing arts particularly as a song writer.
- Former Son-in-law of Vincente Minnelli and Judy Garland. Former half-brother-in-law of Lorna Luft and Joey Luft.
- Was once member of "The Allen Brothers", a musical partnership with guitarist and singer Chris Bell (known in the duo as Chris Allen).
- Former nephew-in-law of Mary Jane Gumm and Virginia Gumm.
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