Intelligence

What is in scope

Heads of external and internal intelligence services and adjacent cybersecurity agencies — the Central Intelligence Agency, the Security Service (MI5), the Secret Intelligence Service (MI6), the Cybersecurity and Infrastructure Security Agency, and equivalents. The MI6 sub-Chief cluster is recorded as its own row to capture the tier-wide composition pattern below the apex.

Why this domain matters

Intelligence-service leadership is selected by a process that is itself classified. Names of contenders are typically not made public; vetting and consultation happen inside the security apparatus and the senior reaches of government. The domain is therefore the most opaque selection mechanism in the dataset.

It is also among the most consequential. Heads of intelligence services control which threats are surfaced to political leadership, which sources are trusted, which operations are authorised, and how the institution's institutional posture is communicated to allies and to the public. A first-woman event in this domain is a stronger signal of something having changed than the equivalent in a domain with more visible inputs, because the selection mechanism that produces it cannot be inspected from outside.

The intelligence-domain trajectory in this dataset — Rimington at MI5 in 1992 (an isolated event), then Haspel at the CIA in 2018, Easterly at CISA in 2021, and Metreweli at MI6 in 2025 — describes a 26-year gap between the first event and the cluster, then three events in seven years.