This plugin adds some content to the bottom of every post. That is all. No extra crap.

Automatically inserts an author bio box below each post. The box contains user's signup date, number of posts, biographical information, gravatar, links to social profiles and optionally a post-specific bio.

Create customizable footers for your posts.

This plugin adds some content to the top of every post. That is all. No extra crap.

Adds an about-the-author box after every post and page. Includes a gravatar-image and a biography from the author.