The world's biggest fund manager, BlackRock, has become an increasingly influential player in Washington, DC. The firm's global head of sustainable investing is set to head Biden's National Economic Council, and a former advisor to BlackRock Chief Executive Larry Fink will serve as a top official at Treasury. BlackRock, the world's largest investment manager, has become an increasingly influential Wall Street player in Washington, DC as a poster child of the revolving door between finance and politics.