This study aims to examine the life, scholarly persona, and religious-intellectual activities of Imam Hasan al-Askari (232–260/846–874), the eleventh imam of Twelver Shiism. Having fulfilled his imamate under the intense pressure and surveillance policies of the Abbasid authority, Imam Hasan al-Askari left an enduring scholarly legacy in the fields of Quranic exegesis, hadith, kalam, and jurisprudence, despite his brief lifespan. Following an investigation of the imam's lineage, family background, and the political conditions of his era, the study examines in detail his conciliatory stance toward the Abbasid caliphs, the network of communication he established with the Shia community through the agency system (wikala), his critical approach to Sufism and philosophy, and his views on fundamental theological issues such as the possibility of the vision of God (ru’yat Allah) and the doctrine of the imamate. Furthermore, particular attention is devoted to the imam's refutation of the objections raised by the Muslim philosopher al-Kindi against the Quran, as well as his success in disputations with Christian scholars. The scholarly and organizational activities of Imam Hasan al-Askari are assessed as the foundational dynamics that prepared the Shia community for the period of the Major Occultation (al-Ghayba al-Kubra).