Guy matriculated in 1973. He read History and won rugby blues in 1975 and 1976. Guy qualified as a solicitor with Allen & Overy in 1980 and went on to be Senior Partner from 2000 to 2008.
Guy is now Chairman of UK Export Finance, The Legal Education Foundation and City Music Services. He is an Adjunct Professor at the Imperial College Business School, Director of BCKR Limited and Co-Chair of the Bingham Centre Development Board. He is an honorary Bencher of Inner Temple and an honorary QC.
Guy received a CBE in the New Year's Honours list for services to export finance and pro bono work in the legal sector.