Dara Khosrowshahi has a lot on his hands. He entered Uber at a time where the reputation of the company was under great scrutiny and internal problems were rampant. Now he's facing a power standoff with former CEO and founder Travis Kalanick. How can the new CEO lead in such turbulent times? Nancy Koehn, Harvard Business School professor and author of the new book, "Forged in Crisis: The Power of Courageous Leadership in Turbulent Times," joins us to give tips on exactly what should be done.