Grand Ayatollah Sayyid Muhammad Saeed al-Tabataba'i al-Hakim (Arabic: آية الله العظمى السيد محمد سعيد الطباطبائي الحكيم‎) (born 1 February 1934) is a senior Iraqi Twelver Shi'a marja, one of the Big Four Grand Ayatollahs of the Hawza of Najaf and one of the most senior Shia clerics in Iraq after Ayatollah Ali al-Sistani.

Sheikh Khalil Jaffer was born in Mombasa, Kenya, and currently resides in Toronto. He holds a degree in computer science, and has worked in software development. His powerful and adept public speaking further developed during the period after his secular studies, where he lectured at his local college.