 Yeboah-Afari was a member of the Brong Kyempem Federation (BKF), which later changed into Brong Kyempem Council (BKC); a group that was founded for the progress of the Bono State.He replaced Nana Agyemang Badu I; the then omanhene (paramount chief) of Dormaa who had left for the United Kingdom for further studies at the University of Oxford.In 1951 he was elected as the first member of the legislative assembly representing Sunyani East on the ticket of the Convention People's Party.