Author Sharon Hernes Silverman calls Pennsylvania the snack food capital of the world. It leads all other states in the manufacture of pretzels and potato chips. The Sturgis Pretzel House introduced the pretzel to America, and companies like Anderson Bakery Company, Intercourse Pretzel Factory, and Snyder's of Hanover are leading manufacturers in the Commonwealth. Two of the three companies that define the U.S. potato chip industry are based in Pennsylvania: Utz Quality Foods, which started making chips in Hanover, Pennsylvania, in 1921 and Wise Foods, which started making chips in Berwick also in 1921. The third, Frito-Lay is part of PepsiCo, and is based in Plano, Texas. Other companies such as Herr's Snacks, Martin's Potato Chips, Snyder's of Berlin (not associated with Snyder's of Hanover) and Troyer Farms Potato Products are popular chip manufacturers.