In 1933 he was a co-founder and the first President of the Gold Coast Medical Practitioners Union, and in 1951 a co-founder and first President of the Ghana branch of the British Medical Association; after Nanka-Bruce's death the two organisations would merge to form the Ghana Medical Association.
1933 war er Mitbegründer und der erste Vorsitzende der Gold Coast Medical Practitioners Union, und 1951 Mitbegründer und der erste Vorsitzende der ghanaischen Sektion der British Medical Association; nach Nanka-Bruce's Tod fusionierten die beiden Organisationen zur Ghana Medical Association.