JOHN DERBYSHIRE is a contributing editor for National Review, where he writes a regular column. He also contributes regularly to National Review Online and writes frequently for a number of other publications, including the Wall Street Journal, the American Conservative, the Washington Examiner, and the New Criterion. In addition to his opinion journalism, he writes on the subject of mathematics and is the author of the books Prime Obsession and Unknown Quantity. His novel, Seeing Calvin Coolidge in a Dream, was chosen as a New York Times Notable Book of the Year. A native of England, Derbyshire now lives on Long Island, New York, with his wife and two children.