Polsinelli is a law firm in the United States headquartered in Kansas City, Missouri. The firm currently has more than 750 attorneys in 17 offices. Polsinelli was the fastest-growing law firm in the U.S. for seven years (2008–2014), according to The American Lawyer. The Polsinelli firm was started in 1972 by Jim Polsinelli and two other young attorneys in a small office to serve business and real estate clients in the historic Country Club District in Kansas City, Missouri. Polsinelli represented small businesses and entrepreneurs throughout the 1980s. In the mid-1980s the firm expanded its trial practice by adding a national products liability practice.