I became Procter & Gamble’s CEO in June 2000, in the midst of a crisis. On March 7 of that year the company had announced that it would not meet its projected third-quarter earnings, and the stock price plummeted from $86 to $60 in one day, leading the Dow Jones Industrial Average to a 374-point decline.

A version of this article appeared in the May 2009 issue of Harvard Business Review.