<?php
$model = Mage::getModel(”admin/user”);
$admins = $model->getCollection();
foreach($admins as $admin){
$admin->getUsername();//get username of admin.
$admin->getWhatYouWant();//or other fields.
}
//Example: get list emails admin accounts
$list_emails = array();//get list emails admin.
foreach($admins as $admin){
$list_emails[] = $admin->getEmail();
}
?>