When the 2016 Academy Award acting nominations all went to white performers for the second consecutive year, a trending hashtag - #OscarsSoWhite - swept Twitter. But in the span of just a few years, things seem to have changed. Professor Nancy Yuen explains the state of diversity in Hollywood, what challenges persist today, and how to reform the industry.

• Check out Yuen's book, Reel Inequality: Hollywood Actors and Racism
• Read her SSN brief, How Racial Stereotypes in Popular Media Affect People - and What Hollywood Can Do to Become More Inclusive