Mark Klein

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Person.png Mark Klein  Rdf-entity.pngRdf-icon.png
(whistleblower, technician)
Mark Klein.jpg
ExposedMass Surveillance
A 2006 whistleblower who revealed how AT&T were partnering with the NSA to spy on their customers.

Mark Klein is a former AT&T technician who leaked knowledge of his company's cooperation with the United States NSA[When?] in installing network hardware to monitor, capture and process American telecommunications.


For over 22 years Mark Klein worked for AT&T. Starting with the company as a Communications Technician in New York, where he remained from November 1981 until March 1991, he later continued in that capacity in California until 1998. From January 1998 to October 2003, Klein worked as a Computer Network Associate in San Francisco. From October 2003 to May 2004 he returned to the role of Communications Technician, after which he retired in May 2004.[1]


The subsequent media coverage became a major story in May 2006, but which was fairly quickly ignored, as per the cases of William Binney, Thomas Drake and Russell Tice - and in strong contrast to the Edward Snowden Affair.


In recognition of his actions, the Electronic Frontier Foundation picked Klein as one of the winners of its 2008 Pioneer Awards.[2]


Event Participated in

WEF/Annual Meeting/201717 January 201720 January 2017Switzerland
World Economic Forum
2951 known participants


  1. Declaration of Mark Klein - Unredacted (June 8, 2006) EFF
  2. AT&T Whistle-Blower Among Award Winners - Newsvine 27 Feb 2008

External links