Senior officer of Pakistan Administrative Service (PAS) Rizwan Memon assumed the office of the Chief Secretary Sindh on Thursday. He is the 55th Chief Secretary since 1936-37, when the Sindh Province came into being. Since the abolition of One Unit on 1st July 1970, Rizwan Memon is the 39th Chief Secretary of Sindh. His predecessor was Muhammad Siddiqui Memon.