"Throughout his long career Rumelt published little. But his influence grew slowly, and interest in his ideas was reignited in 2007 by a widely read interview published in McKinsey Quarterly. His most influential thoughts were contained in just two articles published some ten years apart. In 1982 he demonstrated that there was a statistical link between corporate strategy and profitability, showing that somewhat diversified companies performed better than highly diversified ones. And in 1991 he published a controversial paper arguing that neither the ownership of a business nor the industry that it was in could explain the bulk of the difference in profitability between different businesses. Being good at what you do, he maintained, counted for a lot more."