Possible Clues:

• Film director Jon
• Journalist Barbara
• 'The Core' director Jon
• Media mogul's mate and columnist, Barbara
• "Entrapment" director Jon
• French girlfriend with line for Swiss poet
• 'Creation' director Jon
• ''The Man Who Knew Too Little'' director
• Denys, perhaps, whose rule may have been, obey my collaborator
• Black lady's email server