Making data available in ALL views

I am attempting to make some data available in all view files. This information is displayed in the page masthead and sidebar menu. I know I could pull the data in each and every single controller, but that is tedious and really not efficient. I would like to pull it at some global point and have it available in the view. 
The key is I don't want to have to modify all the controllers to pass the data to the view (or remember to pass in the future). How can I set a variable that is available in a view in say the base controller?
What I have so far (in the base controller):

PHP Code:

class BaseController extends Controller
{

 protected $helpers = ["form", "auth", "phone", "text"];

 public $siteInfo;

 public function initController(RequestInterface $request, ResponseInterface $response, LoggerInterface $logger)
 {

 parent::initController($request, $response, $logger);

 $session = \Config\Services::session();

 helper('siteinfo');
 $this->siteInfo = siteinfo();
 } 


Then in the view I have:

PHP Code:

<?= $siteInfo ?>

I have confirmed that $siteInfo has data before you get to the view, but in the view I get: "Undefined variable $siteInfo"
Feels like I am missing something simple here... help!