How to create a public profile for authors/contributors/users?

I would like to add a public profile page to the authors and others contributors in my site. where visitors can see their profile info.
I don’t wanna use Buddypress, is it possible with WordPress alone?

bainternet posted something in this thread that will help you, (this is actually editing user profiles from frontend) but it will give you the idea, then just echo the fields out on author.php