Hi @roger
My first question is to ask where the user is editing the post.
If the users are logging into the WP backend and editing posts via the normal wp-admin interface, then you could create a custom location rule!
A custom location rule will allow you to look at the current logged in user and compare it to the post’s author. If they match, return true, if not, return false.
This will show / hide the field group on a user basis!
You can read how to create custom location rules here:
http://www.advancedcustomfields.com/resources/tutorials/custom-location-rules/
