He was born in 21st December 1954 at Dera Ghazi Khan, Panjab Pakistan . He belongs to Khosa Baloch Tribe. He passed his matriculation in 1969 from the Multan Board, and secured 5th position . He got 1st position Intermediate exam from Govt. College in the Lahore Board in 1971. He passed BA exam from Gvt College at Lahore and secured 1st position in 1973 . He got MA degree in Language and English Literature from University of the Punjab in 1975. He was admitted to the Queens College,University of Cambridge and did his Master of Laws degree, in 1978 his specialization in Public International Law.in the subjects of the Law of Peace, the Law of War and Armed Conflict, the Law of International Institutions and the Law of Civil Liberties . He became Barrister- at – Law. Then he was called to the Bar on 26th of July 1979 at the Honourable Society of Lincoln’s Inn, Landon, UK.
He enrolled as Advocate of the Lahore High Court on 13th November 1979. He enrolled as an Advocate of the Supreme Court on 12th September, 1985.
He handled several thousands of cases of constitutional , and civil, and service , revenue and election laws as an Advocate of High Court and Supreme Court of Pakistan .
Over 600 cases conducted as an Advocate reported in various Law reports . He served as a Member of the Library Committee and as a Member of the Executive Committee of the Lahore High Court Bar Association, Lahore.
He is the son- in- law of former Chief Justice of Pakistan . Mr Nasim Hasan Shah . He blessed with daughters and 4 grand children .
4 In May 1998, he was elevated to the Bench and appointed as Lahore High Court Judge.
Refused to retake the Oath under the PCO
When general Pervez Musharraf declared a state of Emergency in November 2007, suspended the Constitution of Pakistan and demanded the Judges of the Superior retake their Oath under the PCO “Provisional Constitutional Order”, justice Khosa and many other senior Judges refused to retake the Oath. As a result, they were suspended from their duties on 18th August 2008.
Restored to his position because of Lawyer’s movement
He was restored to his prior position as High Court Justice Lahore as a result of a Lawyer’s movement .
He became the Judge of Supreme Court on 18th of February 2010. There, he was among the larger bench of 7 Supreme Court Justices . He was hearing Prime Minister Yousaf Raza Gillani’s Contempt of Court case .
On 2017, he headed the larger bench of the Supreme Court that was hearing the Panama Case related to the alleged money Laundering and offshore Illegal investment by MP Mr. Nawaz Sharif and his family members.
Art 62 & 63 Disqualification
Remarking Art. No. 62 & 63 of the Constitution of Pakistan in the Case of Panama .
Article No. 62 & 63 Provisions as to Members of Parliament.& Disqualification of Parliament. Related to ‘ Truthfulness & Honesty ‘
Chief of Jamaat-e- Islami is only Truthful & Honest Parliamentarian
Justice Khosa was pointing out that there is no truthful & Honest Parliamentarian except for Chief of Jamaat-e-Islami Mr. Siraj ul Haq. Then, because of heavy pressure, he withdraw from his remarks.
Panama Case Judgement
The final verdict issued by the larger bench on the, Panama Case, against Prime Minister Nawaz Sharif and his family members has proposed a JIT within 60th days . In the final verdict Justice Khosa & justice Gulzar in their remarks disqualified to Nawaz Sharif from running Prime Minister Office
The Election Commission Issued Notification
The Election Commission is directed to issue a notification of disqualification of respondent No. 1 namely Mia Muhammad Nawaz Sharif from being a member of the Parliament with effect from the date of announcement of the present Judgement .