Guy is a partner in the Professional Training Partnership and a director of PTP limited.
He is a member of the lecturing panels for the Institute of Chartered Accountants in England and Wales, the Institute of Chartered Accountants of Scotland and the Chartered Association of Certified Accountants. He specialises in Auditing and Financial Reporting updates (new UK GAAP, IFRS and US GAAP) for accountants in practice and in industry, and in finance courses for members of the wider financial community. He also provides a consultancy service to assist companies in preparing their annual financial statements. Guy makes occasional television appearances and co-presents Accounting TV, a quarterly on-line programme, with Giles Mooney. Guy was a founder member of the Lou Reed fan club, set up in 1971, has contributed to books about Lou Reed and met him on several occasions.