Harriett Tubman On The $20 Bill. Nancy Koehn, June 6, 2019, Audio, “On May 22. Treasury Secretary Steve Mnuchin announced that the $20 bill redesign set to replace President Andrew Jackson with Harriett Tubman would not be pursued during the Trump administration. Harvard Business School historian Nancy Koehn joined Boston Public Radio on Thursday to discuss why the change, initiated by the Obama administration, was delayed.Link