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Mark Klein

American whistleblower

dead

born: 1945
died: 2025
age at death: 79
known for: engineer

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who mark klein is

Mark Lee Klein was an American AT&T technician and whistleblower who revealed details of the company's cooperation with the United States National Security Agency in installing network hardware at a site known as Room 641A to monitor, capture and process American telecommunications. The subsequent media coverage became a major story in May 2006.

from wikipedia, used under CC BY-SA.

where this comes from

wikidata records a date of death for Mark Klein in 2025, which is how we know. your browser re-checks this against wikidata on every visit, so it’s current even if the page itself was cached a while ago.

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