Mwapachu was born on 27 September 1942. He was nominated for the post by Tanzanian President
Jakaya Mrisho Kikwete. He was elected as Secretary General of the East African Community by the Summit of EAC Heads of State on 4 April 2006. Prior to this appointment, Mwapachu was Ambassador Extraordinary and
Plenipotentiary and Tanzania's permanent delegate to
UNESCO. Mwapachu was a law graduate of the
University of Dar es Salaam (degree obtained in 1969.) ==Works==