His studies of law, the Warioba 1966 graduated with a Bachelor of Laws, he graduated from the University of Dar es Salaam. After a period of study at the Hague Academy of International Law, he worked for the Ministry of Foreign Affairs in the Department of International Organizations.
From 1976 he was up to his appointment as Minister of Justice in 1983, Advocate General. This office he held until he became Prime Minister in 1985. Subsequently he served until 1990 as vice president of his country; Furthermore, he was a member until 1995, the Tanzanian Parliament. From 1996 to 1999 he was Warioba Judge at the International Tribunal in Hamburg. Since April 2012, he is chairman of a 30 - member commission to draft a new constitution of Tanzania.
Publications (selection )
- Monitoring Compliance with and Enforcement of Binding Decisions of International Courts. In: Max Planck Yearbook of United Nations Law. 2001, ISSN 1389-4633, p 41
- Moving the Kenyan Constitution Review Process Forward: A Report of the Fact -finding Mission to Kenya. Fountain Publishers, Kampala, 2007, ISBN 978-9970-02-756-9.