Sev’yan I. Vainshtein (1926–2008), Russian anthropologist and historian
In the late 1990s, the well-known Russian filmmaker Leonid Kruglov visited Vainshtein with the proposal to produce a film about his expeditions into Tuva, using as a ‘red line’ Vainshtein’s correspondence with American Nobel laureate Richard Feynman, who had written him a letter in 1981 requesting his help in securing a visa to visit Tuva, which, was not granted during Feynman’s lifetime.