Turnaround artist
Someone who takes an organization, event or something large that is broken and repairs it and makes it work again, and in many cases, profitable and beyond successful. A turnaround artist can be anyone who runs an organization, from a CEO to a President of an organization to any form of a head.
The Salt Lake City Olympic games were on the fritz until Mitt Romney came along as the CEO of the organizing committee and Romney ensured that the games made a profit and ran smoothly, earning him the title of a "turnaround artist". Another turnaround artist would be Lee Iacocca, who worked to make Chrysler profitable in the 1980's and 1990's.