Gary Cohn, Trump's top economic adviser, is leaving the White House. Before joining the Trump administration, Cohn was the second-in-command at Goldman Sachs. "Gary Cohn deserves credit for serving his country in a first class way," Goldman Sachs CEO Lloyd Blankfein tweeted Tuesday. Goldman Sachs CEO Lloyd Blankfein thanked his former deputy, Gary Cohn, following the news of Cohn's departure from the White House on Tuesday. "Gary Cohn deserves credit for serving his country in a first class way," Blankfein tweeted.