His responsibilities include giving lectures and seminars and conducting litigation before various courts in Malawi. Before joining the University of Malawi and co-founding Barnet & James, he worked as a legal practitioner at Makuta & Company and Banda, Banda & Company in Blantyre, Malawi. Mwiza is a member of the Malawi Law Society having been admitted to the Malawi Bar in 2003. He holds a doctor of laws degree (University of Pretoria), Masters of Laws – human rights and democratisation in Africa (University of Pretoria), Bachelor of Laws (Honours) (University of Malawi), Diploma (Abo Akademi) and Post Graduate Certificate in Higher Education (University of Pretoria). Mwiza loves watching football and is a fan of Chelsea FC.