It gave me a chance to get a deeper understanding of who he is and why, as a National Security Agency contractor, he took the momentous step of leaking hundreds of thousands of classified documents.
Among his most shocking discoveries, he told me, was the fact that the N.S.A. was routinely passing along the private communications of Americans to a large and very secretive Israeli military organization known as Unit 8200. This transfer of intercepts, he said, included the contents of the communications as well as metadata such as who was calling whom.
Typically, when such sensitive information is transferred to another country, it would first be "minimized," meaning that names and other personally identifiable information would be removed. But when sharing with Israel, the N.S.A. evidently did not ensure that the data was modified in this way.