When the 'New York Times' revealed the warrantless surveillance of voice calls, in December 2005, the telephone companies got nervous.

The first time I set out to find George F. Kennan, in 1982, I had just turned 21, begun my final semester at Princeton University and noticed with astonishment that the senior thesis deadline had crept to within four months.

In the urgent aftermath of Sept. 11, 2001, with more attacks thought to be imminent, analysts wanted to use 'contact chaining' techniques to build what the NSA describes as network graphs of people who represented potential threats.

Barton Gellman Quotes