Exceptional article by Walter Dean Myers who writes YA stories. His love of books as a child then realizing none were like himself in books. He is African American while all characters were white. He has spoken out against racism and says he has African Americans in his YA stories. Yet in 2013 only 93 of 3200 children books had children of color.
There is a lack of diversity in TV and movies but this is worse, stories and novels are people we most want to identify with, having virtually just a white world of kids lit is not good and could stifle desire to read.
Here is his wikipedia page. Will try his books.