product group

Hello,
I want to display the product group id. Is this possible somehow?
I tried this but it didn't work:

$user = $event->getUser();
$groupId = $user->getGroups();
echo $groupId[];

Cheers

I'm also having problem to get the email in site.php

Am_Di::getInstance()->hook->add(Am_Event::ACCESS_AFTER_INSERT, 'myAccessHandler');
function myAccessHandler(Am_Event $event) {
$access = $event->getAccess();
$user = $event->getUser();
$invoice = $event->getInvoice();
$myEmail = $event->getEmail();
}