The Authors Widget lets you showcase your blog’s writers in your sidebar.
This widget can display the names or avatars of all your blog’s writers, links to a list of all their former posts, as well as links to posts they’ve recently written. Here’s an example of what it looks like when it’s activated on a blog sidebar. It looks great, especially when you have a lot of authors:
Once you add the widget to your sidebar from your Appearance → Customize → Widgets, you’ll see that the widget settings look like this: