Henry Louis Gates Jr. is the Alphonse Fletcher University Professor and director of the Hutchins Center for African and African American Research at Harvard University. An award-winning filmmaker, literary scholar, journalist, cultural critic and institution builder, Gates has written or co-written 22 books and created 18 documentary films, including “Finding Your Roots.” His six-part PBS documentary, “The African Americans: Many Rivers to Cross,” earned an Emmy Award for Outstanding Historical Program-Long Form, as well as a Peabody Award, Alfred I. du Pont-Columbia University Award and an NAACP Image Award. Gates’s new book for young people (with Tonya Bolden) is “Dark Sky Rising: Reconstruction and the Dawn of Jim Crow” (Scholastic). His new book for adults is “Stony the Road: Reconstruction, White Supremacy and the Rise of Jim Crow” (Penguin).