The Financial Post reports in its Friday edition that Chip Wilson, the founder of Lululemon athletica and one of the retailer's top shareholders, is stepping up his campaign against the company's board in the midst of its search for a new chief executive officer. A Bloomberg dispatch to the Post reports that in an open letter cautioning potential candidates, Mr. Wilson criticized current management's willingness to invest and reliance on heavy discounting. He warned that merely appointing a new CEO may not resolve Lululemon's deeper problems. "Until meaningful change in the boardroom has taken place, success for the new CEO could be a perpetual struggle," Mr. Wilson wrote in the letter viewed by Bloomberg. Mr. Wilson's missive is the latest salvo in a years-long pressure campaign following his resignation as chairman and departure from the board over a decade ago. He recently launched a website to air his criticisms and this week even deployed a box truck displaying mobile billboards near the company's Vancouver headquarters. In a letter to shareholders last month, Mr. Wilson said the company's response to his call for changes to the board, including his nomination of three new independent directors, was insufficient.