Lyall joined the Communications Security Establishment (CSE) in 2002 as an intelligence analyst. Since that time, he has held a series of management roles within Signals Intelligence (SIGINT) operations, including a 3-year deployment overseas, and a tour as the Manager of CSE’s 24/7 Operations Centre. From 2018 to 2022, Lyall was a Director in the Intelligence Operations directorate, focusing on hostile state actors and cyber threats. During this period, he was also the chair of the Security and Intelligence Threats to Elections (SITE) Task, helping to counter foreign interference in Canada’s federal elections. Lyall joined the executive team in CSE’s Canadian Centre for Cyber Security in June 2022 and is currently the Director of Risk Mitigation Programs.