"The Political, Social and Technological Construction of Understanding: An Essay in Analysis of the Disruptive." In Construction of Belief: Comparative Perspectives. Abdou Filali-Ansari, ed. Edinburgh: Edinburgh University Press, forthcoming.
"In Search of the Counter-Reformation: Anti-Sufi Stereotypes and the Budshishiyya’s response." In An Islamic Reformation? Charles Kurzman and Michaelle Browers, eds. Lanham, Md: Lexington Books, 2004, pp.125-46.
"Establishments and Sects in the Islamic World." In New Religious Movements in the 21st Century: Legal, Political, and Social Challenges in Global Perspective, Phillip Lucas and Thomas Robbins, eds. New York: Routledge, 2004, pp. 283-312.
"Is there a Church in Islam?" ISIM Newsletter, no. 13 (December 2003), pp. 40-41.
"Sects in the Islamic World." Nova Religio, vol. 3 (2000), pp.195-240.
"Akademisk frihet i två kulturer." Tidskrift för mellanösternstudier [Lund, Sweden] 1998: 2 (July 1999), pp. 47-54.
Religion and politics; terrorism and jihad
"The Concept of Radicalization as a Source of Confusion." Terrorism and Political Violence 22, no. 4 (2010), pp. 479-494.
"Measuring Egyptian Regime Legitimacy." Middle East Critique 19 (2010), pp. 251-267
"Occult Dissident Culture: The Case of Aleksandr Dugin." In The New Age of Russia: Occult Roots and Influences in Soviet and Post-Soviet Russia, Birgit Menzel, Michael Hagemeister and Bernice Rosenthal, ed.s. Forthcoming.
"Sufisme." In Øvre Ægypten: Livet langs Nilen , Nicholas S. Hopkins, ed. Højbjerg: Moesgård Museum, 2003, pp. 147-55.
"The Primacy of the Milieu: The Dandarawiyya’s Unsuccessful Attempt to Change its Identity." In Le saint et son milieu, ou comment lire les sources hagiographiques, Rachida Chih and Denis Gril, ed.s. Cairo: IFAO, 2000, pp. 203-13.
"The Place of Religion in Social Life: The Nature of Ottoman Sufism." In The Great Ottoman-Turkish Civilization, vol 2., Economy and Society, Güler Eren, ed. Ankara: Yeni Türkiye Dergisi, 2000, pp. 505-09.
"Saudi Sufis: Compromise in the Hijaz, 1925–40." Die Welt des Islams: International Journal for the Study of Modern Islam, vol. 37 (1997), pp. 349-68.
"Succession and Inheritance in a Sufi Order: The Case of Ibrahim al-Rash d." Islam et sociétés au sud du Sahara, vol. 11 (1997), pp. 149-61.
Islam in the West
"Sufis as Mythic Bearers of Esoteric Tradition." In Constructing Tradition in Western Esotericism, Andreas Kilcher, ed. Leiden: Brill, 2010, pp. 413-25.
"The Reception of Sufi and Neo-Sufi Literature." In Sufis in Western Society: Global Networking and Locality, Ron Geaves, Markus Dressler, and Gritt M. Klinkhammer, ed.s. London: Routledge, 2009, pp. 180-97.
"European Neo-Sufi Movements in the Interwar Period." In Islam in Inter-war Europe, Nathalie Clayer and Eric Germain, eds. London: Hurst; New York: Columbia University Press, 2008, pp. 183-215.
"Quelques sources du dix-huitième siècle du pluralisme religieux inclusif." In Etudes d’histoire de l’ésotérisme: mélanges offerts Jean-Pierre Laurent, Jean-Pierre Brach and Jérôme Rousse-Lacordaire, eds, Paris: Editions du Cerf, 2007, pp. 49-65.
"Mutations transatlantiques du soufisme." In Sectes, Églises, Mystiques: Échanges, conqu tes, métamorphoses. Bernadette Rigal-Cellard, ed. Bordeaux: Pleine Page, 2004, pp. 157-75.
Traditionalism
"Guénonian Traditionalism and European Islam." In Producing Islamic Knowledge: Transmission and Dissemination in Western Europe, Martin van Bruinessen and Stefano Allievi, eds. London: Routledge, 2011, pp. 169-87.
"Vestlig sufisme og traditionalisme." In Den gamle nyreligi sitet, Vestens glemte kulturarv, Mette Buchardt and Pia Böwadt eds. Copenhagen: Anis, 2003, pp. 139-51.
"From Paris and Cairo to Tehran: Guénonian Traditionalism, the Iranian Revolution, and the Islamic Republic." In Historians in Cairo: Essays in Honor of George Scanlon, Jill Edwards ed. Cairo: AUC Press, 2002, pp. 267-86.
"Traditionalism in Iran." Politica Hermetica [Paris], vol. 16 (2002), pp. 135-49.
“Traditionalist Sufism.” ARIES: Journal for the Study of Western Esotericism, vol. 22 (1999), pp. 3-24.
