A Google search operator that allows a user to restrict the Google search results (SERP) to include results to show pages only about the author you specify. This operator can also be used to restrict Google Groups search results to include newsgroup articles by the author you specify.
The author name can be a full name, partial name or email address. For example, author: stephen king restricts Google search results to pages about the famous author, Stephen King. You may also specify a word in the query to return results of articles written by the author using that phrase. For example, castle rock author: Stephen King will return search results that contain the word “castle rock” written by Stephen King.