German-American author, ex-East German KGB spy
According to Wikipedia,
Jack Philip Barsky is a German-American author, IT specialist and former sleeper agent of the KGB who spied on the United States from 1978 to 1988. Exposed after the Cold War, Barsky became a resource for U.S. counterintelligence agencies and was allowed to remain in the United States. His autobiography, Deep Undercover, was published in 2017, and he frequently speaks on his experiences and as an expert on espionage.
Jack Barsky is affiliated with the following schools: