Well-known Missourians include Chuck Berry, Sheryl Crow, Walt Disney, Edwin Hubble, Nelly, Brad Pitt, Harry S. Truman, and Mark Twain. Some of the largest companies based in the state include Cerner, Express Scripts, Monsanto, Emerson Electric, Edward Jones, H&R Block, Wells Fargo Advisors, Centene Corporation, and O'Reilly Auto Parts. Well-known universities in Missouri include the University of Missouri, Saint Louis University, Washington University in St. Louis. Missouri has been called the "Mother of the West" and the "Cave State", but its most famous nickname is the "Show Me State".