He graduated from the Department of Architecture at the Cracow University of Technology. He holds a degree in architecture, but his real passion is design. In early 1990s, he worked in The Custom Shop in New York where he designed interiors and furniture for men’s clothing shops. In the middle of the decade he started designing interiors for international corporations in Warsaw. He is the founder of the Massive Design company specialising in office and public interior design. Stopa's passion is industrial design. For several years, he has been collaborating with many manufacturers of furniture, floorings, and other finishing materials, including Italian companies Tonon, Italcementi, Casali, Mosaico Digitale, Laminam, Cassamania, and US ones such as the Mohawk Group and DuPont. In addition, “Mac” collaborates with Bolon, Saint-Gobain, Samsung Chemical and with Polish companies such as Nowy Styl, Profim, Mikomax and Acrea.