Sayyid Shahab al-Din Mar'ashi Najafi was one of the Shi'a Marja's after Ayatollah Burujirdi. He reached the Ijtihad level in his 27. He was one of the students of Shaykh 'Abd al-Karim Ha'iri and Aqa Dia' al-'Iraqi, and had benefited from al-Sayyid 'Ali al-Qadi, al-Sayyid Ahmad al-Karbala'i, and Mirza Jawad Maliki Tabrizi. His political views was accordant with Imam Khomeini.
Ayatollah Mar'ashi Najafi, founded a library which is a major library in Iran and the Islamic world, in terms of the number and the quality of the manuscripts. He founded the seminary schools of Mar'ashiyya, Shahabiyya, Mahdiyya, and Mu'miniyya.