Stasior has an impressive pedigree (you can read his resume and see a really geeky binary image he posted of himself here). The MIT Ph.D. has taught here too and has done stints at Oracle, Netcentives and AltaVista. He came to Amazon in 2003 as its director of search and navigation.
He will now be in charge of Siri, which is Apple's famous voice-activated personal-assistant program. The tech giant acquired Siri in April of 2010 to garner a big stake in voice-activated search.