The River and the Wall is going to be one of the most-talked about documentaries of 2019 because of its timeliness in the current political environment. Some filmmakers inject themselves into the story for one reason or another. In this case, Ben Masters happens to be a wildlife filmmaker. Masters is joined by NatGeo Explorer Filipe DeAndrade, ornithologist Heather Mackey, river guide Austin Alvarado, and conservationist Jay Kleberg. Together, they make the journey down the 1200 mile trek of…"SXSW 2019: The River and the Wall"