Peter Muller-Munk Associates (known as PMMA) was an American industrial-design firm that flourished in Pittsburgh under the direction of its charismatic name partner. PMMA's work touched almost every aspect of industrial design and were especially influential in the realm of consumer goods. Notably, U.S. Steel hired PMMA to work on the general aesthetic design for the Unisphere, the theme center of the 1964 New York World's Fair.[1][2]