need a little help

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i am looking for some research on a peculiar phenomenon i've noticed over the years. my former company employs zero african-americans in senior management positions, and seems to frown upon african-americans who aren't (there is no way to say this delicately) virtually illiterate. i won't go into the gory details, but they really do seem to prefer black people who can't speak standard english to those who can. i have my own theory about this, but it would be helpful if i could find actual some research. i recall a book that was written a couple of years ago about african-american professionals and the discrimination they face, but i cannot remember the title.

can anyone point me in the direction of some research on this subject? thanks.