Six of television's top drama series bosses- Sam Esmail (Mr. Robot), Julian Fellowes (Downton Abbey), Nina Jacobson (American Crime Story), Marti Noxon (UnREAL, Girlfriends' Guide to Divorce), Melissa Rosenberg (Jessica Jones) and John Ridley (American Crime)- open up about the stories that made them genuinely nervous, diversity in Hollywood and what it takes to cast their shows.

Sam Esmail, Marti Noxon, John Singleton, Steve Canals, Sera Gamble and Nic Pizzolatto discuss the challenges in creating a drama series today.