Described as "The Dean of Harry Potter Scholars"[1] his specialisation is iconological literary criticism, reading at four layers: the surface, moral, allegorical, and sublime (anagogical).
[6] Granger brings the same literary criticism model to the allegorical and anagogical aspects of Stephenie Meyer's Twilight Saga,[7] Suzanne Collins' Hunger Games trilogy[8] and C. S. Lewis' Chronicles of Narnia.
[9] He has been a featured speaker at Harry Potter conferences in Orlando, Las Vegas, Toronto, Los Angeles, Philadelphia, Illinois, San Francisco, Chicago, Chestnut Hill Archived 16 May 2017 at the Wayback Machine, Washington, D.C., St Andrews and Ottawa in addition to giving talks and classes on symbolist literature and iconological criticism at schools and other venues around the US.
Granger has been a guest speaker at the Torrey Honors Institute at Biola University, California,[10][11] Pepperdine, Washington & Lee, La Salle, Cornell, Penn, Yale, University of Chicago, Baylor, St Andrews, the Wade Center at Wheaton College, Loyola, Augustana, UNC, USC, the New York C. S. Lewis Society, New York Public Library, and the Past Watchful Dragons C. S. Lewis Conference.
Granger believes, following Mircea Eliade, that because forms of entertainment in a secular or profane culture serve a mythic and religious function; the most popular works will be those with transcendent imagery, structure, and meaning.