I am writing an analysis paper (not related to title), and need to introduce someone with a doctorate in English. Do I write "Doctor [name]" or do I use a suffix?
If the choices are something like
then you need to follow the editorial guidelines of the publication where your own paper will appear.
My inclination is not to include the qualification at all, because it interrupts the text and it should appear in the citation. It goes without saying, surely, that anyone you cite would be worthy of a citation and you don't need to put that evidence in the text.
But this may not follow the expected form for your own publication.