[SOLVED] Author name and bio in only one parent category.

i would like to amend the code for the single post byline to show authors name, only for certain categories. As well, i would like the authors description/bio at the bottom of these posts.

I have two main categories in my site. One is "projects". the other is "articles". I need the articles to feature authors, but not the projects.

Would you know where/how i could amend the code to do this, or is there a plug-in i could use.

thank you once again. This is the best theme ever.