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Photo illustration: Aïda Amer/Axios. Photo: Andrew Harnik and Al Drago/Bloomberg via Getty Images

In his eight years at the helm of America's central bank, Jerome Hayden Powell has guided the U.S. economy through extreme tumult and fought off unprecedented presidential efforts to undermine the Federal Reserve's independence.

The big picture: It is Powell's approach to duty and public service that is his ultimate legacy as a leader and that will shape his place in history.