Investor criticism of the former McKinsey consultant, who transformed Valeant from a small drug company into a behemoth through acquisitions, included questioning of both his overall leadership and his handling of the present crisis, especially with regard to investor relations. Another large Valeant shareholder told Reuters that Pearson should stay, and that the stock plunge has been exaggerated, given that the accounting questions have been raised about only a small number of Valeant drugs, which together are responsible for about 10 percent of the company’s revenue.