Hilary Schneider, a former senior vp of Knight Ridder who was seen as a possible successor to chairman Tony Ridder before the company’s demise, has landed at Yahoo as a senior vp of a new business unit called Marketplaces. Schneider, a South Bay resident who will be based in Sunnyvale, will develop an overarching classified and listings strategy for Yahoo, the company said in a press release. She will look for new ways “monetizing transaction listings across Yahoo!, as well as have day-to-day oversight of Yahoo!’s Marketplaces properties in the U.S., including Autos, Classifieds, HotJobs, Personals, Real Estate, Shopping & Auctions, Travel and Yellow Pages.” At Knight Ridder, she oversaw half of the company’s newspapers including those on the West Coast, and supervised KR’s digital division. Before that she was president and chief executive of Red Herring Communications. Previously, she was in top management at the Baltimore Sun.