Three UK today announced the appointment of David Hennessy as chief technology officer (CTO).
David, who has been CTO for Three Ireland since 2008, will now lead a dual role in the Technology and Operations functions across both businesses, responsible for the network and IT systems.

In the UK, David will focus on delivering the £2 billion + investment in building the UK’s fastest 5G network, which is based on the UK’s largest 5G spectrum portfolio and recently acquired lower frequency spectrum, trebling Three’s spectrum holding.

At Three Ireland, David has driven the growth and strength of the network, overseeing an investment of over €700 million in Network & IT infrastructure in recent years including its recent deployment of 5G. This commitment has seen Three named as Ireland’s Speedtest Award Winner for fastest mobile network speed by Ookla.

David will take over from Susan Buttsworth, Three UK’s Chief Operating Officer (COO), who will be leaving Three UK in June 2021. Susan has worked for CK Hutchison for 25 years in a number of roles across the Group and joined Three UK as COO in October 2019 to put the foundations in place to improve the network experience.

Susan’s achievements include the partnership with Ericsson to deliver the UK’s fastest 5G network, completion of its data centre transformation, reaching 1250 5G sites and leading major enhancements to the 4G network. Susan will work with David to hand over responsibilities. The role of COO will not be replaced at Three UK.