[1] Kolimba was born on 29 December 1939 in Manda-Nsungu Village, and he took his secondary education at Chidya Secondary School in Masasi District and Minaki High School before joining university education for Bachelor of Law degree (LL.
Kolimba was a professional lawyer who was one the first of 14 Tanzanians to study law at the University of Dar es Salaam.
Kolimba was appointed by Nyerere in 1976 as Principal Secretary of the Ministry of Public Service (Central Establishment).
Then, he worked as Principal Secretary for the Ministry of Labour and Social Welfare with Alfred Tandau as a Minister.
The Act established a machinery design to regulate and facilitate the engagement of all non-disabled persons in productive work and connected matters.