Under his father's supervision, Modarresi followed a solid traditional curriculum in the hawza, studying classical works on various disciplines of Islamic jurisprudence as well as the ancillary faculties commonly taught at religious learning institutions.

A graduate of the acclaimed al-Qaim Theological Research Institute at the Sayyidah Zaynab Mosque in Damascus, Modarresi reached the level of sotouh al ulya (upper foundations).

His classical curriculum embodied a methodology which crystallizes the middle way of Islam; respect for the differences between jurists, and a spiritual education drawn from the Qur'an and the traditions of Muhammad and his household, the Ahlulbayt.

Modarresi was also agitated by the West's silence to the situation in Bahrain, and writes in one his articles:[7]"Whether western leaders decide to cut their losses or keep the Bahraini government on life support for the time being, by far the worst thing they can do is bury their heads in the sand and assume everything is going to be all right...

[9] In the second decade of 2000, Modarresi shifted his attention to writing in English, and has authored or edited several books, including: He has also written a collection of essays regarding the contemporary challenges facing Muslim youth, with emphasis on problems which are more relevant in Western nations where they are a growing minority.