Hon Justice Uwani Musa Abba Aji (JSC) was born on the 7^th November, 1956 in Gashua, Yobe State. She attended Central Primary School Gashua and Government Girls Secondary School Maiduguri for her Primary and Secondary Education between 1961 and 1972. She obtained a Diploma in Law from the prestigious Ahmadu Bello University Zaria in 1976 and subsequently, an L.L.B Hons from the same institution in 1980. She was called to Bar in 1981 and commenced her career as State Counsel in 1982. Prior to holding this position however, She had held positions of Clerical Assistant (Area Courts Division), Assistant Registrar, Acting Registrar and Higher Registrar between 1973 and 1982. After her appointment as State Counsel in 1982, she rose through various positions becoming an Acting Senior State Counsel in 1984, Senior Magistrate II in 1986, Senior Magistrate I in 1987, Chief Magistrate II in 1989, Chief Magistrate I in 1991 and Chief Registrar in November 1991. She was appointed Higher Court Judge of Yobe State Judiciary in December 1991 making her the first Lady Judge at Yobe State Judiciary, a position she held until July 2004 when she was elevated to the Court of Appeal.

His Lordship has over the years served as Secretary, Magistrates Association of Nigeria, Borno State Branch; Senior Magistrate in Charge of Mobile Traffic Court, Borno State; Chairman, Magistrate Association of Nigeria, Borno State Branch; Chairman, Potiskum Judicial Disturbances Commission of inquiry; Chairman, Damaturu/Potiskum Judicial Commission of Inquiry; Amairah, Federation of Muslim Women Association of Nigeria (FOMWAN); President, National Association of Women Judges (NAWJN), National Legal Adviser of FOMWAN and Chairperson, Justices Welfare Committee of the Court of Appeal. She had also served in various election petition tribunals in addition to being a designated ICPC Anticorruption Judge between 2001 and 2014 and a Life bencher in 2018. His Lordship hat attended various Seminars and Conferences both nationally and internationally and has also presented several papers in various workshops. She has also received various commendations during the course of her career.

Before her elevation to the Supreme Court on January 8^th 2019, His Lordship was the Presiding Justice, Court of Appeal Kaduna Division, a position she held for 4 years. She is happily married with three children and enjoys reading, writing and gardening. She has also travelled far and wide to almost all the continents in the world.