Executive Committee

Appointed to the Board: 2014

Committee membership: ESG

Skills and experience

Andrew has served as Gamma’s Group Chief Executive Officer since 2022, having previously held the role of Group Chief Financial Officer. He has played a significant role in the Group’s growth and financial development, leading its evolution into a pan-European provider of business-critical communications technology.

Andrew began his career in audit and corporate finance at Deloitte LLP and Ernst & Young, where he advised a broad range of technology sector clients. He subsequently moved into industry, joining Xansa plc in a business development role before joining Gamma in 2007 as Finance Director for the UK Channel business.

He holds a first-class degree in Mathematics from St John’s College, Cambridge and an MBA from Warwick Business School. He is a Fellow of the Institute of Chartered Accountants in England and Wales.

Other roles

None

Nationality British

Appointed to the Board: 2022

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.

Nationality: British

Chris joined Gamma in 2021 to lead the Company’s People and Engagement strategy, having worked as a board-level HR leader, and subsequently as a consultant, on business transformation and organisation design programmes for organisations across multiple sectors and geographies such as Vodafone, Equinix, Aviva Investors, the Financial Ombudsman Service and the British Olympic Association.

She holds a first class honours degree in English from Leeds University

Chris joined Gamma in December 2020 from Aptitude Software where he held the role of Chief Product Officer. Prior to this Chris held a number of leadership roles in strategy, product management and marketing in several different operating businesses within The Sage Group plc, one of the leading providers of business management solutions to SMEs globally.

Chris holds a MPhys in Physics from Jesus College, Oxford.

Colin joined Gamma in January 2024 from Openreach where he spent five years as Chief Technology and Information Officer. During this time, he designed and built the IT & Network platforms which underpinned the UK’s largest full-fibre rollout.

Prior to this, Colin held a number of leadership roles at the BT Group, including CTO of the BT Group Consumer & Business divisions, driving IT transformation and launching a range of new products – including Business VOIP platforms, BT Sport and the first BT Business hub with integrated fixed and mobile services.

Colin is a graduate of Queen’s University Belfast with a degree in Computer Science.

David joined Gamma in 2012 following Gamma’s acquisition of his last start-up communications business, Varidion Limited, and built Gamma’s direct go-to market organisation. He is responsible for driving growth of our Enterprise and Public Sector market share across Europe as CEO – Gamma Enterprise.

A passionate advocate for technology disruption and an engineer by trade, David has built, owned and run multiple IT and communication service providers that have challenged and changed how organisations buy and use business technology.

Before this, David had senior IT roles in the NHS, a large city law firm and a brokerage house, and was the co-founder and CTO at Sirocom Limited and Group CTO at Azzurri Communications.

In June 2024, John was appointed as CEO – Gamma Business, having previously been appointed as COO in 2023.

John joined Gamma in 2011 bringing more than 15 years of experience delivering successful transformation programmes in financial services, utilities and telecoms sectors. After eight years as a change management consultant, he then took an operational role for Gamma in 2013 and since that time has worked in various senior roles, overseeing customer services to Channel Partners and Service Providers.

Gerben was appointed CEO – Gamma Europe in April 2025 to lead our consolidated European business unit, which primarily covers Germany, Spain, the Netherlands and Belgium. He joined Gamma in August 2020 with responsibility for business activities across the Netherlands and Belgium, before his role was expanded in 2023 to include management of the German business. Gerben started his career at KPN where he worked for ten years. After KPN, Gerben was based in France leading several European Mobile Virtual Network Operators (“MVNOs”). Gerben spent time at Telefonica Deutschland and Tele2 in the Netherlands, where he was CEO of Blau Mobilfunk and Managing Director of the Consumer market, respectively. Gerben has held multiple senior leadership positions in prominent Telco companies across Germany, the Netherlands, France and the Caribbean.

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.