It sure is. If you go below the post editor you will see a section that is called Story Design and Author. Within the Author box you can select a different author. You could go ahead and create several other WordPress users as authors and then simply select which author you would like for that post. You can associate the post with a different user as an admin and never need to share login information with the authors.
“1. authors – the system currently requires authors (mentioned on the top of an article) to be added as users but all we want to do is publish an author’s name with the text instead of it automatically publishing under our own names.”
Hope that answers this question.