How to split authors?

When you look at the Template hierarchy, then you’ll notice that there’re actual author archives:

Archive Page: author-{$nicename}.php >> author-{$id}.php >> author.php

This means, that you can simply add an author.php file to your theme and style it whatever you want. The Loop will give you all posts by this author. If you want to style them differently per author, then use author-{$nicename}.php template files.

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