Abu al-Hasan Muhammad ibn al-Husayn, known as Sayyid Radi, was a highly distinguished Muslim scholar and poet. His brilliance blossomed under the celebrated Shaykh Mufid as well as other prominent scholars. Sayyid Radi demonstrated proficiency in the various Islamic sciences, and had mastered the Arabic language. He was also the founder of Dar al-‘Ilm, a large school held for various lectures, meetings, and academic debates. Due to his pure faith and intellectual capability, Sayyid Radi was appointed as the Chief of the Alwaites during his era, the head of the High Court, and the supervisor of the Hajj pilgrimage. This article presents a brief account of his life, teachers, and students, as well as his services and achievements which attested to his great influence during his era as well as years to come.