StaffPage.php
================

<?php

class StaffPage extends Page {

	public static $has_many = array(
    	'StaffMembers' => 'StaffMember',
    	'Departments' => 'Department'
  	);

	public function getCMSFields() {
   		$fields = parent::getCMSFields();

		$gridFieldConfig =$gridFieldConfig = GridFieldConfig_RecordEditor::create();
		$gridfield = new GridField("StaffMembers", "StaffMember", $this->StaffMembers(), $gridFieldConfig);
		$fields->addFieldToTab('Root.Staff', $gridfield);

		$gridFieldConfig2 =$gridFieldConfig = GridFieldConfig_RecordEditor::create();
		$gridfield2 = new GridField("Departments", "Department", $this->Departments(), $gridFieldConfig2);
		$fields->addFieldToTab('Root.Departments', $gridfield2);

		return $fields;
	}

}

class StaffPage_Controller extends Page_Controller {
}

StaffMember.php
================

<?php

class StaffMember extends DataObject {

	public static $db = array(
		'Name'=>'Varchar',
		'Details'=>'HTMLText'
	);


	public static $has_one = array(
		'Image' => 'Image',
		'Page' => 'Page',
		'Department' => 'Department'
	);

	// Summary fields
	public static $summary_fields = array(
		'Thumbnail' => 'Thumbnail',
		'Name' => 'Name'
	);

	public function getThumbnail() {
		return $this->Image()->CMSThumbnail();
	}

}

Department.php
================
<?php

class Department extends DataObject {
	public static $db = array(
		'Name'=>'Varchar'
	);

	public static $has_many = array(
		'StaffMembers' => 'StaffMember'
	);
}