Simon is a founding member of SoNG (the Southern Normativity Group), a member of Kent’s Aesthetics Research Centre, and a current member of the Executive Committee of the British Philosophical Association.
From 2008 to 2014, he was President of the British Society for Ethical Theory, which is the leading society in the UK for moral philosophy. He co-edits a book series, Bloomsbury Ethics, with Thom Brooks.