Stasior previously ran Amazon's search engine since the departure of Udi Manber and held the position of president and CEO of A9.com. Prior to co-founding A9, Stasior was a key executive for at DEC's search engine AltaVista.
Apple did not reply questions on Bill Stasior's work at the company, though it's believed that he will be helping to run the Siri effort.
Apple's Siri is clearly in need of some talent as the virtual assistant has lost some of its original appeal and has not improved much since its original introduction with iOS 5. The company is apparently replacing Siri's founder Adam Cheyer, who came to Apple as part of his Siri's acquisition by Apple in 2008.
Cheyer left Apple in June, following Siri CEO Dag Kittlaus, who left in October of last year. Cheyer is currently listed as an advisor for Change.org.