* The Complete Tolkien Companion (2006)
* Tolkien:A Biography (2013)
* The World of Tolkien's The Lord of the Rings (2014)
* The Fellowship of the Ring:A Reader's Companion (2016)
* The Two Towers:A Reader's Companion (2017)
* The Return of the King:A Reader's Companion (2018)
Άρθρα
* "Tolkien's Mythology" (2007)
* "The Lord of the Rings:A Cultural History" (2008)
* "Tolkien and the Great War" (2014)
* "The Inklings:A Literary Fellowship" (2015)
* "The Lord of the Rings:A Guide for the Perplexed" (2016)
Άλλο
* Editor, The J.R.R. Tolkien Encyclopedia:Scholarship and Critical Assessment (2006)
* Παραγωγός, The Lord of the Rings:The Return of the King Extended Edition DVD (2004)
* Αφηγητής, Ηχητικό βιβλίο The Hobbit (2004)
* Προσκεκλημένος λέκτορας, Πανεπιστήμιο της Οξφόρδης (2007-2018)
* Επισκέπτης υπότροφος, Πανεπιστήμιο του Λιντς (2019-σήμερα)