I don't know about African American philosophy, but among Latin American philosophers Enrique Ambrosini Dussel has done much to advance a unique perspective on epistemology and philosophy of science. In the English-speaking world his work has been championed by Sandra Harding, who was mentioned by another commenter.
On the African-American perspective, nothing leaps to mind, sorry. Anybody else have suggestions?
I've recently started a 'It is the mark of an educated mind to be able to entertain a thought without accepting it' sort of pursuit- I'm currently stumbling through Lois Tysons' "Critical Theory Today: A User-Friendly Guide"
EDIT: I mean that I'm doing my best to suspend/address whatever judgments I currently have, not immediately discard what I read.
Unfortunately this does not necessarily require an educated mind.
http://publicnoises.blogspot.com/2009/02/aristotle-and-accur...
There are a few good comments there, too, followed by a bunch of me-toos.