Crosby was born May 12, 1904 at Briton Ferry, near Neath in South Wales. He graduated with a BD degree from the University of London in 1927, then a BA in philosophy from the same university. He left for Sierra Leone in 1929, though returned to Britain temporarily in 31, where he was ordained and also married to his fiancee Dorothy.
In Sierra Leone, his service included being a part of a team that translating the Bible into Mende, helping to found the Bunumbu Press, and serving as the first principal of Bunumbu Union College (now Bunumbu Teachers College).
In 1939, he was awarded a PhD degree from the University of London for his dissertation A study of the Mende Language. He wrote of the Mende language, "I was brought up on the classics and had been taught that classical Greek was the most perfect instrument of speech ever devised. I accepted this, of course, unthinkingly and believfed it implicitly until I met the Mende language. But then I began to think differently. I marvelled at its incredible beauty, its wonderful cadences, its skillful nuances and the deeper I went the more I learned to wonder" (Tuchscherer 1998:220).
- 1944. An Introduction to the Study of Mende. Cambridge University Press.
- Tuchscherer, Konrad. 1998. Kenneth Hubert Crosby (1904-1998): pioneer of the Mende language. Journal of African Cultural Studies 11.2: 217-220.