Pulling values from a sepcific row in table

$leader_result = $wpdb->get_results("SELECT user_first_name, user_last_name FROM ".$wpdb->prefix."mro_attendees WHERE event_id = ".$project_id." AND user_role="team_leader" LIMIT 0,1")

foreach($leader_result as $row=>$value)
{
echo $value->column_name;
}