After a nearly 15-year career at Potash Corporation of Saskatchewan (TSX: POT)(NYSE: POT), Bill Doyle is stepping down as CEO of the company. Mr. Doyle has been the face of the company for a long time, and is a legend in the industry. His absence will certainly create a void. Replacing him will be Jochen Tilk, who last worked as CEO of Inmet Mining before it was taken over by First Quantum Minerals ( TSX: FM ) early last year. The end of an era When Mr. Doyle joined PotashCorp back in 1987, it was still owned by the Saskatchewan government. And the government seemed more concerned about keeping lots of people employed at the mines rather than running the operation at a profit. Production was always maximized regardless of price, and PtoashCorp typically lost money. Mr. Doyle changed that. After PotashCorp became a publicly traded company in 1989, Mr. Doyle spearheaded a new price-over-volume strategy that is still in place. It turned PotashCorp into a profitable business.