Daniel worked for GCHQ, the UK’s intelligence, cyber and security agency for 20 years. He was the UK’s Head of Cryptographic Design and Quantum Information Processing, part of the initial National Technical Authority function assumed by the new National Cyber Security Centre (NCSC). In this role he was responsible for briefing the Government’s Chief Scientific Adviser in cryptomathematical matters. Daniel also served as Head of the Heilbronn Institute for Mathematical Research (HIMR), which is a linchpin of the government’s “Advanced Mathematics” strategy. Daniel represented GCHQ in helping to found and direct the National Quantum Technologies Programme. During his career, Daniel’s results and expertise have earned him multiple prizes, including an international award for best crypto-mathematician, and on three separate occasions an international award for the year’s best cryptanalytic achievement. Daniel designs weekly puzzles for a national newspaper.