You may have never heard of Clarence Avant, but this enigmatic manager, producer and record executive has touched the lives of a wide array of people you have heard of: Bill Withers, Hank Aaron, Barack Obama. Director Reginald Hudlin tells us about his new Netflix documentary ‘The Black Godfather,’ which profiles the now 88-year-old Clarence Avant, the ultimate unseen mover in music, movies, politics and more.