Magento: Get admin user’s data (id, name, username, email, password, etc).

$userArray = Mage::getSingleton('admin/session')->getData();

$user = Mage::getSingleton('admin/session');
$userId = $user->getUser()->getUserId();
$userEmail = $user->getUser()->getEmail();
$userFirstname = $user->getUser()->getFirstname();
$userLastname = $user->getUser()->getLastname();
$userUsername = $user->getUser()->getUsername();
$userPassword = $user->getUser()->getPassword();