From this book review

It is plain that the core of his identity, his heart of hearts, is not that of a man who is black. It is that of a man who knows a whole lot more about things than you do and is intent on setting you straight, at length if necessary, if you’d only listen. Take a look at those glasses, that awkward grin, those sweater-vests, and consider his deep interest in Albert Einstein and other geniuses: Thomas Sowell is less an African American than a Nerd American.