David Selinger was an early employee at Amazon, working directly under Jeff Bezos. He led the R&D arm of Amazon’s data-mining and personalization team. He co-founded Redfin (now a multi-billion-dollar real estate company) and founded Rich Relevance, a company that offers personalized shopping experiences for large retail brands, including Macy's, Barneys New York, Office Depot and others. He is now inventing the next BIG thing in home security.