$arSelect = Array("ID", "NAME");
$arFilter = Array("ID"=>"370");

$res = CIBlockElement::GetList(Array(), $arFilter, false, Array("nPageSize"=>50), $arSelect);

while($ob = $res->GetNextElement())
{
    $arFields = $ob->GetFields();
    $arFields = CUser::GetByID(intval($arFields["ID"]));
    var_dump($arFields->Fetch());
}