:Hi Snowman. I think Ian J. Mason is probably the best title for his page at the moment as that is how his name appears where I have come across it, mainly as the coauthor of various books.  Sure you could make it Ian Mason (ornithologist), or (taxonomist) or (writer) or (collection manager), but simply Ian J. Mason reflects how the name is generally met with. I also think a dab page (even for, at present, only two names) is the simplest and most elegant way of dealing with any potential ambiguity. Cheers.