In a 2005 article Anthony Walsh, professor of criminal justice at Boise State University, argued a review of post-WWII serial killings in America finds that the prevalence of non-white serial killers has typically been drastically underestimated in both professional research literature and the mass media. As a paradigmatic case of this media double standard, Walsh cites news reporting on white killer Gary M. Heidnik and African-American killer Harrison Graham. Both men were residents of Philadelphia, Pennsylvania; both imprisoned, tortured, and killed several women; and both were arrested only months apart in 1987. "Heidnik received widespread national attention, became the subject of books and television shows, and served as a model for the fictitious Buffalo Bill in "Silence of the Lambs"", writes Walsh, while "Graham received virtually no media attention outside of Philadelphia, Pennsylvania, despite having been convicted of four more murders than Heidnik".