Excerpt:

Mr. Stiller was for many years a model citizen of communist East Germany, where he had been a member of the Free German Youth as a teenager and joined the state Communist Party by 21. His loyalties began to shift by the mid-1970s, according to Kristie Macrakis, a Georgia Tech professor who studies espionage and chronicled Mr. Stiller’s story in the 2008 book “Seduced by Secrets: Inside the Stasi’s Spy-Tech World.”

She said that Mr. Stiller was disillusioned with the repressive politics of East Germany, but also frustrated with a career that had stagnated and with a strait-laced German society that abhorred his lavish, womanizing lifestyle.

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