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[...]Riordan's website emphasizes his role as former middle school teacher, a preserver of cultural artifacts generated by others; in the Resources section, visitors may download teachers' guides and curricular materials, while students visiting the Biography section are admonished in distinctly teacherly tones, \"If you are doing a school report and need information about Rick Riordan, this is the best site to use. [...]the popularity of the series means that we may view Riordan also as a franchising phenomenon who has transformed the original five books not only into international best sellers but also into film adaptations (two at the time of this writing), merchandise (t-shirts, posters, replica swords, Nintendo games), day camps run by independent bookstores from Texas to Georgia to Brooklyn, and three related book series: the Kane Chronicles (Egyptian, three volumes, 2010-12), the Heroes of Olympus (Roman, five volumes, 2010-14), and Magnus Chase and the Gods of Asgard (Norse, 2015- ).