How to force an author to be the author or default author of all posts and pages?

Hi WPMUDev,

I want to know how to force an author to be the author or default author of all posts and pages?

Is there a simple functions.php snippet for this? I couldn't find one or a plugin to draw from.

When updating a site where there is only one author for everything, it just makes more sense if I could force the author that need be.

This can be done through duplicating a post, but with a few people who help manage the site from posting the content and on page SEO, I would like to just force the correct author so nobody has to keep in the back of the head or checklist to make sure the author is the one it should be.

Thanks in advance for any help,