Authors in menu, template list post by author

By default, you can view posts by authors with a URL of the form {home_url}/author/{author-slug}/

If you’ll be writing any PHP and need to output a link to an author’s posts, see the function get_author_posts_url.

Edit: If you’ll be writing your own author post page template, the filename should be one of the following formats: author-{nicename}.php, author-{id}.php, or author.php. The templates override in the order I listed them — last one being the fallback.