He was born in England, but played club rugby for Welsh clubs Abertillery and Neath. He is, however, most associated with Llanelli. Moon was born in Birmingham, England to Henry and Audrey Moon.
Like his father, Moon was educated at Queen Mary"s Grammar School, Walsall, as was his elder brother, Richard Henry Quentin Barker Moon, who played international rugby for England at scrum half.
He played international rugby for Wales, winning 24 caps. Rupert then endeavoured to represent Ashorne and Moreton Morrell Cricket Club on 4 July 2015, running out star player Gary Hammersley. Moon famous for sayings such as "they"re gonna fold!" And "he"s only got one shot".
Moon subsequently became a radio and television presenter on British Broadcasting Corporation Wales, and then became Head of Group Commercial & Business Development for the Welsh Rugby Union and the Millennium Stadium, when the Group recorded record turnover and record profits.
He also was one of three people who staged the Tsunami Relief Concert at the Millennium Stadium. He joined Protectagroup - Wales"s Largest Insurance Broker - in 2007 (acquired by Cullum Capital Ventures) as Group Marketing Director during an aggressive United Kingdom acquisition period, with 36 brokers acquired during an 18-month period at value of £254 million.
He then returned in June 2009 to his spiritual home of the Scarlets as Commercial Director. In 2012, Moon sought election to Carmarthenshire County Council in Gorslas, but was unsuccessful.
Moon played junior rugby for England Rugby Union at student, Under-19, Under-21, and 'B' level, before qualifying for Wales by playing his club rugby for Abertillery Reconstruction Finance Corporation, Neath Reconstruction Finance Corporation, and Llanelli Reconstruction Finance Corporation. Moon went on to captain Llanelli, a team he played 272 games for over 12 years.
Moon earned 24 caps for the Wales national rugby team, before retiring from international rugby in 2001.
