Kevin Warsh was sworn in as the new chairman of the United States Federal Reserve on Friday, reigniting conversations around interest rate policy and inflation.

Never before has a chair of the US Federal Reserve been so controversial. Who is Kevin Warsh? Can he preserve the Fed's independence, or will he become Donald Trump's puppet?

New Fed chief inherits an institution split over rates, with inflation stuck above the 2% goal and energy costs climbing due to the Iran war