This plug-in will add the post authors biographical information (from their wordpress profile) to the bottom of the post (although only on the single page view of the post, not the main page).
The label that’s displayed infront of the users first name is configurable on the plug-ins settings page.
The plug-in can be downloaded from the wordpress plug-in repoistory.
If you like this plug-in, consider sending me a donation. Information on how to do so can be found here.