MediaWiki:UploadFormAuthorHelp

Author: You must indicate the author(s) of this work. Give as much information as you can. If you need more than one line, click the button to the right of the field.

If there is a {{Creator}} template for a famous author, use it. (See the list.) For instance, if Creator:Charles Roscoe Savage exists, entering "{{Creator:Charles Roscoe Savage}}" in the field will add a box giving relevant information about that person, and also automatically add the file uploaded to a category containing works by this author.