Sinclair teaches Philosophy twice a week at the London School of Economic Science. He has been the chairman of a number of charities, including the School of Communication Arts, The Designers and Art Directors Association, The Art Academy and the Independent Educational Association. He was briefly chairman and a trustee of the
Tony Blair Faith Foundation. He is a governor St. James School, a senior member and lecturer in the School of Philosophy, and for ten years, was organiser of the School's annual event known as
Art in Action at Waterperry. He was a founding shareholder in the
Dukes Education group of companies He is the author of the book,
Brutal Simplicity of Thought. The thesis of Sinclair's book is to strip creative thought back to ensure that advertising campaigns have maximum impact in their simplicity. Along with his wife Jacqueline, Sinclair authored the children's book
Faces, Faces, Faces, published by Penguin Random House. The story explores the world of faces that children see in inanimate objects. The inspiration behind the book comes from previous artwork that his wife created, as well as her enjoyment of the children stories that Sinclair told their own children. Sinclair was appointed
Commander of the Order of the British Empire (CBE) in the
2017 New Year Honours for services to advertising. Sinclair created and co-wrote the 1988 British television comedy series for children
News at Twelve. The series followed 12-year-old Kevin Doyle (Ewan Phillips) and his nightly "news bulletins" about the events in his life (and some events from his imagination). == References ==