Knoll was founded in New York City in 1938 by Hans Knoll. Production facilities were moved to Pennsylvania in 1950. After the death of Hans in 1955, his wife Florence Knoll took over as head of the company. The company is headquartered in East Greenville, Pennsylvania and has three other major manufacturing sites: Toronto, Grand Rapids, and Muskegon. In addition, the company is listed on the New York Stock Exchange (NYSE) and trades under the symbol:KNL