According to biodata available on the official website of the Supreme Court of Pakistan, Justice Tassaduq Hussain Jillani was born on July, 6, 1949. He did Masters in Political Science from Forman Christian College, Lahore and LL.B., from the University of Punjab, Lahore.
He completed a course in Constitutional Law from the University of London at the Institute of Advance Legal Studies.
He started practice at district courts, Multan in 1974; enrolled as an Advocate of the High Court in 1976; elected as General Secretary, District Bar Association, Multan in 1976, elected Member Punjab Bar Council in 1978, and appointed Assistant Advocate General, Punjab in July, 1979.
He was enrolled Advocate of the Supreme Court in 1983 and was appointed Additional Advocate General, Punjab in 1988, appointed Advocate General Punjab in 1993.
He took oath as a Judge of Lahore High Court on August 7, 1994 and was elevated as Judge of the Supreme Court of Pakistan on July 31, 2004 where he served till the imposition of the state of Emergency on the 3rd of November, 2007.
As he refused to take fresh oath, he was made dysfunctional as a Judge of the Supreme Court. After the restoration of democracy and elected Government in Pakistan, he joined as Judge of the Supreme Court in September, 2008.
He has participated and represented in number of international meetings, conferences, seminars and dialogues. Naming few amongst many are 3rd Malta Judicial Conference on Cross-Frontier.
In July, 2008, he was invited by the American Bar Association to receive the 2008.
Rule of Law Award on behalf of those Judges of Pakistan who demonstrated courage in upholding the 'Rule of Law' in the country. He is Co-chair of the Hague Conference Mediation Committee in Family International Law.