The template for the document type "presentation" includes a field for "presenter", but not for "author". It seems to me that both presenter and author fields should be available.
Why, because Presenter may be someone else than Author? I think about it as the creator of the work. A speech read on behalf of A should still be attributed to A. So the name 'Presenter' may be confusing here, but I don't think it makes sense to add an additional field for 'Author'. There is an additional 'Contributor' field available though (click on Presenter).
Upgrade Storage
There is an additional 'Contributor' field available though (click on Presenter).