Mark Klein
American whistleblower (1945-2025) · United States · On the map · Scientists · Died at 79
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.
Mark Klein is read about 65 times a day, in 10 languages.
A typical day, 30 days to 24 August 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 60 days, one point a day.
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About this person
The subsequent media coverage became a major story in May 2006.
Country
United States
Category
Scientists
Type
Scientist
Status
Deceased
Dates
Lived 1945 to 2025 · aged 79
