This isn't working for me. I am using the exact set up, but cannot render a list of all of the authors. Has this changed? To clarify, I am referring to @keith regarding the for loop. Did that work for you?
+1 @polodev i need this too. How to list all posts by author with multiple authors PER post. Like one post can have multiple authors ( like in scientific papers) while I want to list all authors in a list with the number of posts that they where writing on.