Installation is pretty straight forward: Make sure your theme is widget-ready, upload “recent-by-author.php” to the “/wp-content/plugins/” directory, activate in Plugins menu, and the add it to your sidebar in Design>Widgets menu
Here is the admin box:
Title: – Like most widgets, there is an option for a custom title.
Show post counts – Shows the total post count next to the authors name.
Number of recent posts to show: – When greater than 0, a sublist is displayed under an author’s name with up to the set number of posts.
Show full names – Displays the authors first and last name instead of their chosen public name.
Hide empty authors – If an author has no posts, then they are not shown in the sidebar.
Exclude admin – Hides the admin from being shown in the sidebar.