As a producer, Simon has made documentaries for BBC Radio 3 and Radio 4, BBC Studios and Hammer as well as overseeing two Doctor Who adventures starring Tom Baker. Simon has been a regular writer on titles ranging from Horrible Histories Magazine to medical journal The Lancet, and was for 13 years a reporter for Hansard in the House of Lords. He has been a guest on Front Row and The Infinite Monkey Cage for BBC Radio 4, and has given talks at venues ranging from the the National Portrait Gallery to the Blue Dot science festival at Jodrell Bank.
Simon is currently the chair of the books committee of the Writers' Guild of Great Britain.