Onesmus Mwbonje joined Jonathan as one of the first trustees of the Giriama Fund in 2023.

Onesmus was born and raised in the region of Kenya where Giriama is principally spoken, before becoming a research fellow in the department of Natural Sciences, Centre for Environmental Policy at Imperial College, London. Onesmus is currently sponsoring a number of children through their education in Kenya. Having attended school in Kenya himself, Onesmus has an inherent knowledge of the education system and how funds can be used to bring about significant positive change.