As tomorrow I am fortunate enough to have been invited on BBC Manchester to talk about chemistry, and given the chance I may direct people towards A Retrosynthetic Life, I thought this weeks Mega Chemist should be a little more accessible to all. Rather than the standard organic chemist you are used to, this week I have gone for a great historical figure in the world of chemistry. The fact the image is a painting rather than a photo should point you at least a little in the right direction. Can you identify this weeks mega chemist? Suggestions to @karldcollins or via email.