Tim Masters describes himself as "just a mattress maker," but that belies the business acumen he's gained over decades of building and selling beds. Tim's store in the Chicago suburbs, Quality Sleep Shop, opened in 1969 and has held its own against the proliferation of private equity-backed mattress corporations and chain stores. As Big Mattress has grown more complex, churning out endless permutations of confusingly named products, Tim has embraced simplicity.