Forget Zuckerberg, Bezos or Jenner, Vladimir Putin is Secretly the Richest Man in the World. Born 1972, Sergei Leonidovich Magnitsky was a Russian lawyer and accountant. For much of his career, he worked at Firestone Duncan, a law and audit firm based out of Moscow, where Magnitsky served as a specialist for legal, tax, and accounting needs of foreign ventures doing business in Russia; one of the businesses he represented, was investment advisory firm Hermitage Capital Management.