After speaking at the Art in Authentication Congress in The Hague, I confirm that I am withdrawing the “advice service” I have been providing. This is the relevant statement.
Attribution and other enquiriesAfter almost 40 years of responding carefully to every message about attribution and other enquiries, including many concerning supposed “secrets” hidden in Leonardo’s works, I am stepping aside from this aspect of my activity. As a professor, I have been committed to the notion of public service, and have not taken any money for opinions, but the quantity of material I receive and the abuse to which I am subsequently subject on the internet means that this ideal is no longer sustainable in the IT age. I am sorry. This is a pity, but my work as a historian in public is being seriously distorted, not least by the unnecessary personalisation of arguments about matters of judgement. I will continue to engage selectively with a few major items/issues and with important developments in the academic and public domains.