Recently, Dr. Khalil Andani was invited on the Abbasid History podcast to give an introduction to Ismailism. Dr. Andani gives perhaps the most succinct introduction to the Ismaili history by answering questions about Fatimids, Ismaili subgroups, and ritual praxis.
Click the link to listen to the podcast at the source: EP013 Dr. Khalil Andani on a brief history of Ismailism
Khalil Andani holds a Ph.D in Islamic Studies from Harvard University (Department of Near Eastern Languages and Civilizations) and serves as an Assistant Professor of 
Religion at Augustana College.
He is currently writing his first book based on his dissertation, titled “Revelation in Islam: Qur’anic, Sunni, and Shi‘i Ismaili Perspectives”, which is a historical investigation of Islamic theologies of revelation in the formative and classical periods of Islam, beginning with the Qur’an and extending through Qur’anic commentary (tafsir), Sunni and Shi‘i prophetic tradition (hadith), Sunni theology (kalam), and Shi‘i Ismaili philosophy. https://www.khalilandani.com/
Subscribe to Dr. Khalil Andani’s YouTube channel where you will find wealth of information related to Ismailism. https://www.youtube.com/c/KhalilAndani/videos
Abbasid History Podcast: An audio platform for the study of the pre-modern Islamic(ate) past and beyond. We interview academics, archivists and artists on their work for peers and junior students in the field. We aim to educate, inspire, perhaps infuriate, and on the way entertain a little too. Suitable also for general listeners with an interest in geographically diverse medieval history.
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