An Okie is a person identified with the state of Oklahoma. This connection may be residential, ethnic, historical or cultural. For most Okies, several (or all) of these connections exist and are collectively the source of their being Oklahoman. Prominent Okies included singer/songwriter Woody Guthrie and country musician Merle Haggard. John Steinbeck wrote about Okies moving west in his Pulitzer Prize-winning 1939 novel The Grapes of Wrath, which was filmed in 1940 by John Ford.