Alexander Esenin-Volpin

Alexander Sergeyevich Esenin-Volpin (also written Ésénine-Volpine and Yessenin-Volpin in his French and English publications; ; May 12, 1924 March 16, 2016) was a Soviet-born American poet and mathematician. He was a known dissident, political prisoner and a leader of the Soviet human rights movement. He spent a total of fourteen years incarcerated and repressed by the Soviet authorities in prisons, psikhushkas and exile. He worked at Boston University.
In 1973 he was one of the signers of the Humanist Manifesto. In 2005, Esenin-Volpin participated in "They Chose Freedom", a four-part television documentary on the history of the Soviet dissident movement.
Volpin died on March 16, 2016, aged 91.