You can add an author to collections and YouTube assets through Batch Edit after creating the asset. The bad thing about that is it loses it's tag if someone goes into the asset and saves changes to it.

It would be much easier if there was an author field in the asset.

We built a newsroom directory by using a Utility: Text promo (flex) block for each individual staff member. http://www.postbulletin.com/newsroom/