Mr. Muhammad Ather Saeed joined his father late Syed Saiduddin in 1973 as a tax associate. He was enrolled as an advocate in May 1975 and an Advocate of the High Court in May 1981. In 1981 he took over the firm and practiced tax laws and corporate laws from the original side up to the Supreme Court of Pakistan.

In October 2005, he was elevated as a Judge of the Honorable High Court of Sindh and served with distinction in this Court and headed the Tax Bench of this Court for almost four years. In 2011 he was elevated as a Judge of the Supreme Court of Pakistan and retired from this Court in September 2014. After his retirement he re-joined Saiduddin & Co., as a partner. He has authored a number of landmark judgments not only in tax matters but in the field of banking, criminal law, intellectual property, arbitration, service law and almost all branches of law. Presently he is involved in a number of arbitration proceedings and rendering opinion and advices on tax and other branches of law.