Brad Ingelsby, Mark Ruffalo and Tom Pelphrey. Emilio Madrid Logo text After Mark Ruffalo wrapped I Know This Much Is True, the 2020 HBO limited series based on Wally Lamb's tragic novel about a paranoid schizophrenic man in the wake of a violent breakdown, he decided he needed a break from heavy material. He was looking for a comedy, but the comedies weren't coming. He made Poor Things and All the Light We Cannot See and then HBO came calling again - with a show centered around a grieving FBI agent. "They were like, 'I think we might break him,'" Ruffalo says with a laugh.