Contact sales

The Board

The board is responsible for the group’s strategy and for overseeing the group’s performance. The Board’s focus is on strategy, development, growing shareholder value, oversight and control, and corporate governance.

Martin Hellawell

Skills and experience

Martin was appointed as Gamma’s chair on 1 July 2023. He joined Softcat plc in 2006 and held executive positions until 2018 as CEO and managing director, during which he led the company through a highly successful IPO and its first two years as a PLC. He took on the role of chair of Softcat in 2018 and stood down at the end of July 2023. Prior to Softcat, Martin spent 13 years at Computacenter plc, where he was responsible for the marketing function, ran Computacenter’s French subsidiary and led acquisitions in the United Kingdom, Belgium and Germany.

Other roles

Martin is chair of Raspberry Pi Trading Limited and independent non-executive chair of AIM listed musicMagpie plc.

Andrew Belshaw

Skills and experience

With a background as a chartered accountant, Andrew has worked in both audit and corporate finance at Deloitte LLP and Ernst & Young, specialising in providing advice to a wide range of clients in the technology sector. After leaving private practice, Andrew worked alongside the commercial director in a new business development role at Xansa plc before joining Gamma in 2007.

Andrew has a degree in maths from St John’s College, Cambridge and gained an MBA from Warwick Business School. He is a Fellow of the Institute of Chartered Accountants in England and Wales.

Andrew was promoted to CEO in 2022 having formally been Gamma’s interim CEO and former CFO.

Other roles


Bill Castell

Skills and experience

Bill joined Gamma in 2022 from OVO Energy, where he held the role of CFO. Before joining OVO Energy in 2020, Bill spent three years at Virgin Media which he joined as deputy CFO and later became acting CFO. From 2005 to 2017, Bill was at Barclays Bank where he held several senior finance roles including CFO at Barclays Corporate Bank and CFO 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.

Rachel Addison

Skills and experience

Rachel has nearly 30 years of finance and operational management experience. She has held several senior financial, operational and board level roles including at Future plc (CFO), TI Media Limited (CFO), Reach Regionals (Managing Director), Local World Limited (CFO and COO), Northcliffe Media Limited (CFO and COO) and Boots the Chemist where she was head of risk management.

Rachel is a chartered accountant and is a member of the Institute of Chartered Accountants in England and Wales.

Other roles

Rachel is currently a non-executive director of Marlowe plc, a business-critical services and software provider; Hollywood Bowl plc, a leading international leisure operator of ten-pin bowling and mini-golf centres; Watkin Jones plc, housing developer and manager of student and build to rent accommodation and Wates Group, a privately-owned construction, residential development, and property services business.

Charlotta Ginman

Skills and experience

Charlotta began her career at Ernst & Young, where she qualified as a chartered accountant. She was then appointed to a series of senior roles in investment banking with UBS, Deutsche Bank and JP Morgan both in London and Singapore, where she gained considerable M&A transactional experience.

Charlotta has also held senior roles within Nokia Corporation, including acting as CFO of its luxury mobile phone division Vertu Corporation Limited.

Other roles

Charlotta is a non-executive director of two investments trusts, Pacific Assets Trust PLC and Polar Capital Technology Trust Plc, and acts as Audit Committee chair for the former; Senior independent director and chair of the Audit Committee of Keywords Studios plc (AIM); and senior independent director of Unicorn AIM VCT PLC, a Venture Capital Trust (AIM), and of Boku Inc (AIM).

As three of Charlotta’s roles are with investment companies that have only 4-5 meetings a year and the others are all AIM listed, with less regulatory burden than a premium listing, Charlotta has sufficient time to devote to each of her roles.

Xavier Robert

Skills and experience

Xavier is a senior private equity professional with more than 20 years of experience in M&A and investment, deal experience across Europe and the US. He is the CIO of the global private equity firm Bridgepoint and sits on the Executive and Investment Committees. Previously, Xavier was in charge of technology investment globally for his private equity firm.

Other roles

Xavier is chairman of Qualitest, the largest privately-owned software testing company. He is also on the board of Kyriba, the #1 software solution for corporate treasury management, and on the board of MiQ, the #1 programmatic advertising company.

Shaun Gregory

Skills and experience

Shaun has had an extensive career across media, advertising and telecommunications spanning more than 30 years. He has held senior roles across Emap PLC, Telegraph Media Group, Blyk and Telefonica. More recently, he has been the CEO of Exterion Media and IYUNO Media Group and is currently the CEO of EMG Group.

Shaun has also been a non-executive director on many company boards, including WEVE, Telefonica’s WAYRA, Ocean Outdoor, Bliss Media and Proxama. He has also served on several Trade Body Boards, including the MMA and the Advertising Association.

Shaun studied at both Ashridge and Wharton Business School.

Other roles

Shaun is currently non-executive chairman of Jonckers, a Belgian-based translation services and localisation technologies company; an independent non-executive director of HYGH, a digital advertising business based in Germany; a board member of Childline (NSPCC); and chairs the Advisory Board for The Sheffield Children’s Hospital.

Rachael Matzopoulos

Rachael was appointed as company secretary of Gamma in January 2023 having previously gained governance experience in a variety of large multinational listed groups, most recently at GSK plc and Videndum plc. As company secretary, she is responsible for advising the board, through the Chair, on all governance matters.

She is a Fellow of the Chartered Governance Institute and has a masters degree in business and management from The University of Glasgow.