Whittaker Chambers (April 1, 1901 – July 9, 1961), born Jay Vivian Chambers and also known as David Whittaker Chambers, was an American writer and editor. After his early years as a Communist Party USA member and Soviet spy, he renounced communism, became an outspoken opponent, and testified at Alger Hiss's perjury and espionage trial. He described both events in his book Witness, published in 1952.