In Captain Fantastic, Viggo Mortensen plays a survivalist father raising a brood of six kids off the grid in the forests of the Pacific Northwest, whose life is thrown into disarray after his wife commits suicide. The film, written and directed by veteran character actor Matt Ross (Silicon Valley, Big Love) earned major praise at Sundance and Cannes, and for good reason: it's by turns intense, funny, and genuinely moving. I recently caught up with editor Joseph Krings to talk about his career and the process of cutting the film.