Mattiazzi and Herman Miller By partnering with Mattiazzi, Herman Miller expands your choices for furnishing interiors. As with Herman Miller, Mattiazzi believes in authored design. It continues to partner with the world's leading industrial designers, including Nitzan Cohen, Sam Hecht, and Ronan and Erwan Bouroullec. And like us, Mattiazzi advocates for the environment. All its equipment is solar-powered; its wood is never chemically treated.