Basically there are two kind of lists of all authors you may want to display.
1. Rather short one you can place in the sidebar for example.
It uses function <?php wp_list_authors(); ?> and following arguments are available:

  • optioncount: display number of published posts (1=true, 0=false)
  • exclude_admin
  • show_fullname; if true first and last name is displayed, if false ‘nickname’ is displayed
  • hide_empty; don’t display authors without posts

The most often I use
<?php wp_list_authors('show_fullname=1&optioncount=1'); ?> which shows full name and number of posts written by each author.

2. The second option is list of all authors/users displayed on separate page with additional info on them. I use for it page template created by Kaf Oseo. I have to admit it’s not only written very well but it’s also very easy to customize because author put comment on each piece of code that can be change adjust it to your needs.
Here you can get the original file. First copy it to any text editor and change its layout to fit the one represented by theme you use (mostly stuff like renaming id content with main or call narrowcolumn with entry). Then you need to go through all available options of information being display and comment out/remove ones you don’t need (by default – if there is any data entered to particular info it will show up on authors/users lists). Now you need to save it as eg. all-users.php and add to your theme folder. When file is ready go to your admin panel and create new page. Name it Users/Authors or whatever suits your needs and assign All Authors Template to it. That’s all. Publish and refresh your site :).
Below you can download file I’ve created for site using Paalam theme. It shows all users excluding administrator.
  All Authors (8.7 KiB)
There is also author page -> page that shows all posts by given author plus some additional info on him/her. It uses Author Template but there is an excellent article on it in WP Codex, so I won’t repeat it here ;).