From wikipedia:
William Least Heat-Moon, byname of William Trogdon is an American travel writer of English, Irish and Osage Nation ancestry. He is the author of a bestselling trilogy of topographical U.S. travel writing.
His pen name came from his father saying, "I call myself Heat Moon, your elder brother is Little Heat Moon. You, coming last, therefore, are Least." Born in Kansas City, Missouri, Heat-Moon attended the University of Missouri where he earned bachelor's, master's, and Ph.D. degrees in English, as well as a bachelor's degree in photojournalism. He also served as a professor of English at the university.