def METHOD_NAME(self, request, organization_pk, pk):
    """
    Adds an existing user to an organization as an owner.
    """
    org = Organization.objects.get(pk=organization_pk)
    user = User.objects.get(pk=pk)
    created = org.add_member(user)
    # Send an email if a new user has been added to the organization
    if created:
        try:
            domain = request.get_host()
        except Exception:
            domain = 'seed-platform.org'
        invite_to_organization(
            domain, user, request.user.username, org
        )
    return JsonResponse({'status': 'success'})