Posts are posted only to specific pages

Here is what I am trying to do, I have a site which had 6 separate contributors, what I need to do is have each of them be able to make posts to their respective blog page with out affecting the main pages posts.

What I am thinking is I create a category for each of them, i.e. blogger1, blogger2, and so on. but how do I get the posts to only show up on their pages? and not the main page to the site?

Help… is there a plugin or something?

Marc