Ken McCallum
Ken McCallum is the Director General of MI5, the United Kingdom's domestic security service, a post he has held since 2020. He spent his career inside MI5 before that, heading its counter-terrorism branch and holding senior operational roles. He is the first person born and raised in Northern Ireland to lead the service. McCallum has become a prominent public voice on threats to the UK from Russia, Iran, and hostile state activity.
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