James C. “Jamie” Nicholson is a historian and author of “The Kentucky Derby: How the Run for the Roses Became America’s Premier Sporting Event” and “Never Say Die: A Kentucky Colt, the Epsom Derby, and the Rise of the Modern Thoroughbred Industry.” The focus of the Lexington native’s recent release is John Morrissey, the gambler, prizefighter, criminal and U.S. congressman who founded Saratoga Race Course.