De Graft-Johnson yɛ adwuma se mfididwumayɛfoɔ wɔ Ghana. Na ɔyɛ ɔkyerɛkyerɛfo wɔ Kwame Nkrumah university of Science and Technology wɔ Kumasi, na akyire ɔbɛyɛ ɔkwankyerɛfo. Ɔka wɔn wɔhyehyɛɛ mfididwumayɛfoɔkuo a ɛde Ghana Institution of Engineers (GhIE),  na ɔyɛ ɔkwankyerɛfo firi 1977 kosii afe 1978.