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.
