Sheikh Tusi, also known as Abu Ja'far Muhammad ibn al-Hasan al-Tusi, was a prominent Persian Shia scholar and theologian born in 995 CE. He is best known for his contributions to Islamic jurisprudence, philosophy, and hadith literature. His works, such as Al-Tahdhib and Al-Istibsar, are foundational texts in Shia Islam and continue to be studied by scholars today. In addition to his scholarly achievements, Sheikh Tusi played a significant role in the establishment of the Najaf seminary in Iraq, which became a major center for Shia learning. His influence extended beyond his lifetime, shaping the development of Shia thought and education for centuries.