Alex Mansfield

This plugin allows you to display an unordered list of links to a specific author’s latest posts (or a list of multiple authors). It can be called either with a shortcode or from within a theme file.
To call it with a shortcode, use <code>[latestbyauthor author="username" show="3"]</code> where “username” is the login name of the author (or a comma separated list of multiple authors) and “3” is the number of posts to display. If you don’t specify an author or a display number, it will show the latest 5 posts from the author of the current page. If you want it to display the post excerpt as well, you can use the following code: <code>[latestbyauthor author="username" show="3" excerpt="true"]</code> This will only show exerpts that you have entered manually.
To call it from within a theme template, you have to wrap it in this PHP function: <code><?php echo do_shortcode('[latestbyauthor author="username" show="3"]'); ?></code>

Latest Posts by Author

Displays an unordered list of an author's latest posts.

Gargron

Displays authors of a collaboration post in place where only one is shown by default. Uses custom fields (key=<code>coauthor</code>;value=user’s username; one per user). Note: If it doesn’t automatically display the co-authors you must manually add <code>if(function_exists(wt_the_coauthors_link)): wt_the_coauthors_link(); endif;</code> into your theme (in PHP <code><?php ?></code> brackets, of course).

WT Co-authors

Using WordPress Custom Fields, and without editing any template files, lets you credit all authors on collaboration posts.

Latest Posts by Author vs WT Co-authors