Charles Lutwidge Dodgson a.k.a. Lewis Carrol was a mathematician and he published enough original mathematical research.
Of course, he is much more famous as a fiction writer than as a mathematician and it can be easily argued that much more important mathematicians (e.g. Grassmann & Clifford and many others) are missing from that timeline, but he certainly cannot be considered as a non-mathematician.
Of course, he is much more famous as a fiction writer than as a mathematician and it can be easily argued that much more important mathematicians (e.g. Grassmann & Clifford and many others) are missing from that timeline, but he certainly cannot be considered as a non-mathematician.