Mark can be contacted via

• His literary agent for books Charlie Viney @ The Viney Agency
• His literary agent for scripts Michéle Browning @ Milburn Browning Associates
• His agent for speaking engagements Tom Kenyon-Slaney tom@londonspeakerbureau.com at The London Speakers Bureau, +44 (0)20 8748 9595.

Or directly at mark@optimistontour.com