Tiffany and Tiffany have developed hundreds of products, from mass-market tubular steel for Amisco to high-end designer showroom and contract products for such manufacturers as AMERICAN LEATHER, Preview, Directional, Thonet and Jack Lenor Larsen. It was reported in the New York Times by Joseph Giovannini that their designs in bent laminated wood for Plycraft "qualify as" " classics....  original statements that promise to have a long life in American homes."

In 1992 they launched The Spirit Collection, a unique design line of studio-built art furniture and upholstery, which they continue to design, manufacture, and offer privately.