Chief Financial Officer

Bill Castell

Skills and experience

Bill joined Gamma in 2022 from OVO Energy, where he held the role of Chief Financial Officer. Before joining OVO Energy in 2020, Bill spent three years at Virgin Media which he joined as Deputy Chief Financial Officer and later became acting Chief Financial Officer. From 2005 to 2017, Bill was at Barclays Bank where he held a number of senior finance roles including Chief Financial Officer at Barclays Corporate Bank and Chief Financial Officer of Barclaycard Europe.

Bill started his career as an Officer in the British Army and, as a qualified accountant (FCA), has worked in the technology, media and telecom sector as an auditor at Deloitte and investment banker with Goldman Sachs.
Bill is a Fellow of the Institute of Chartered Accountants in England and Wales.

Other roles

Bill is also a Non-Executive Director of the Financial Ombudsman Service.