SAN FRANCISCO - Kevin Ryan may not be a household name, but two criminal investigations that the departing U.S. attorney for coastal Northern California is overseeing are widely known: steroids in sports and stock options backdating by corporate America. Ryan, who was among a handful of top prosecutors nationwide who announced their resignations Tuesday to the backdrop of pressure from the Bush administration, leaves his office with both issues still squarely in the public's attention. Last July, Ryan became the nation's first U.S. attorney to file charges against company executives for allegedly violating securities laws by backdating stock options without...