Get the author of any object, in a generic way, assuming the content was administered through the Django admin.

logentry_author.py

def author(self):
    entries = (LogEntry.objects
               .filter(content_type=ContentType.objects.get_for_model(self), object_id=self.pk)
               .filter(Q(action_flag=ADDITION | Q(action_flag=CHANGE)))
    # switch to -action_time if you want the last edit, rather than the first.
    return entries.order_by('action_time')[:1][0]