Mariana van Zeller is a Portuguese journalist and is currently a TV correspondent for the National Geographic Channel. Mariana is also known for the Peabody award winning documentary "The Ox... Read allMariana van Zeller is a Portuguese journalist and is currently a TV correspondent for the National Geographic Channel. Mariana is also known for the Peabody award winning documentary "The Oxycontin Express".Mariana van Zeller is a Portuguese journalist and is currently a TV correspondent for the National Geographic Channel. Mariana is also known for the Peabody award winning documentary "The Oxycontin Express".