Uber's next CEO faces 3 steep challenges

Uber CEO Travis Kalanick has resigned. His successor will have to manage a myriad of troubles for the company. "The thing that made him and the company successful is now causing havoc," Brad Stone, author of The Upstarts, which chronicles category-altering companies such as Uber and Airbnb, says of Uber CEO Travis Kalanick. SAN FRANCISCO -- Want to run Uber? You'd better have a steel constitution for cleaning up cultural rot and the insight to make the leaky business profitable.