Stehrenberger Design, also known as Mark Stehrenberger Design (MSD), was an automotive and product design consultancy founded in California in 1969 by Swiss-born designer Mark Stehrenberger. The studio specialized in transportation concept development—exterior and interior proposals, ergonomics studies, market research—and, when required, construction of full-scale concept car mock-ups. It gained early visibility through Stehrenberger’s widely…