Eric La Flèche, the CEO of Metro, a Canadian grocer, has been instrumental to improving margins. When he took the helm in 2008, the firm's profitability was average. Since then, it's improved almost every year and is now the leader.
This a sparkling example of the power of having a strategic leader take over the reins of a company. Given that he joined in 1991 as General Manager, Real Estate Development, and has since then held various management positions, it's no doubt he knows the company inside out and is best positioned to make the needed changes.