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 Chair of The Legal Education Foundation, The Temple Music Foundation and City Music Services, he is Co-Chair of the Bingham Centre Development Board. He is a Director of BCKR Limited and the National Pro Bono Centre. Guy is an Adjunct Professor at Imperial College Business School. 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.