"adminhtml_customer_save_after"

<?php
/**
* Copyright � 2016 Magento. All rights reserved.
* See COPYING.txt for license details.
*/

namespace AmitshreeCustomerObserver;

use MagentoFrameworkEventObserver as EventObserver;
use MagentoFrameworkEventObserverInterface;


class Customersaveafter implements ObserverInterface
{
    protected $_request;
    protected $_layout;
    protected $_objectManager = null;
    protected $_customerGroup;

    /**
    * @param MagentoFrameworkObjectManagerInterface $objectManager
    */
    public function __construct(
        MagentoFrameworkViewElementContext $context,
        MagentoFrameworkObjectManagerInterface $objectManager
    ) {
        $this->_layout = $context->getLayout();
        $this->_request = $context->getRequest();
        $this->_objectManager = $objectManager;
    }

    /**
    * @param MagentoFrameworkEventObserver $observer
    * @return void
    */
    public function execute(EventObserver $observer)
    {

    echo "<pre>";
    $event = $observer->getEvent();
    $customer = $event->getCustomer();
    print_r($customer->getData());
    die('Observer Is called!');

    }
}

$event = $observer->getEvent();
$customer = $event->getCustomer();
print_r($customer->getData());