 He was a member of the Phi Kappa Psi Fraternity and the Irving Literary Society.The concept of "duty-free shopping" – offering high-end concessions to travelers, free of import taxes – was in its infancy when, with Chuck Feeney, Miller founded DFS on November 7, 1960.DFS began operations in Hong Kong, where it still maintains its corporate headquarters, later expanding to Europe and other continents.