J. Samuel Walker is a professional historian and the author of, among other titles, Three Mile Island: A Nuclear Crisis in Historical Perspective; Prompt and Utter Destruction: Truman and the Use of Atomic Bombs against Japan; Most of 14th Street Is Gone: The Washington, DC Riots of 1968; and The Road to Yucca Mountain: The Development of Radioactive Waste Policy in the United States. He lives in the Washington, DC, area.