To qualify the person would need to have worked for/in an EA aligned organisation or have been somehow directly involved with EA orgs/discussion groups for at least 6 continuous months at some point in their lives. This also includes involvement at university/school level.

Proof of this could simply be statements made by the person which explicitly indicate their involvement (over 6 months), ie wouldn't necessarily have to be an employement contract etc

I will exclude monarchs in constitutional monarchies eg the British royals will not be taken into consideration