In 2019, he co-launched Enza Capital which backs founders and teams using technology to solve large and meaningful problems across Africa. Headquartered in Nairobi, Enza has invested in more than 40 African tech companies to date. John sits on the board of a number of Enza’s portfolio companies.
He has served as Chair of the Raspberry Pi Foundation since 2020. In June 2024, the Foundation’s commercial subsidiary, Raspberry Pi Holdings, listed successfully on the London Stock Exchange, crystalising an endowment of nearly $800m to drive the Foundation’s global mission to enable all young people to realise their full potential through computing and AI.
He is a Fellow and President of the UK’s Royal Academy of Engineering, and a Fellow of BCS, the UK’s chartered institute for IT.
He has also been an active angel investor and technology start-up mentor in the UK and Africa, with more than 40 individual pre-seed/seed investments.
In 2016, he stepped down as Chairman and CEO of Metaswitch Networks. He joined the company in 1987 as a software engineer and became Chief Executive Officer, and then Chairman, as the company established its leadership in cloud communications software. Metaswitch was acquired by Microsoft in 2020.
He was awarded a Knighthood for services to Engineering and Technology in the King’s New Years Honours 2025 and a CBE for services to Engineering in 2016.