Yegor Gaidar, the architect of Russia's market reforms in the 1990s, has died aged 53, his spokesman has said, BBC reported.
The spokesman did not provide any details.
Mr Gaidar was Russia's acting prime minister in 1992, launching the "shock therapy" reforms after the collapse of the Soviet Union.
Mr Gaidar is credited with carrying out the first wave of privatisations under President Boris Yeltsin. His lifting of price controls was highly unpopular.