[xwiki-users] List of all users: names and avatars; edit profile pages

Hello, for our company intranet wiki i'd like to have a page where all coworkers are listed with their names and pictures. I found a velocity code to give out the useravatar (e.g. #largeUserAvatar('XWiki.username') ), but is there a way to automatically generate a page where all the users are listed with names and pictures (perhaps in 2 columns and with links to their profile pages)? I only found a way to list all editors or page creators. And second, i would like to add information to the profile pages of the coworkers, e.g. their specialities or responsibilities. How can i do that? Thanks in advance, resi.