 Another prolific author, Mark Yerger, published 11 books up to 2008, mostly through Schiffer Publishing.According to MacKenzie, authors in the revisionist tradition range from "extreme admirers [on] the fringes of the far-right," such as Richard Landwehr and Jean Mabire, to partisan authors (Gordon Williamson and Edmund L. Blandford), and popular historians who generally present the Waffen-SS in a positive light.These include John Keegan, James S. Lucas and Bruce Quarrie.