Limited Series I KNOW THIS MUCH IS TRUE, Starring Mark Ruffalo; Written For Television And Directed By Derek Cianfrance, Debuts April 27, Exclusively On HBO Based On Wally Lamb’s Award-Winning New York Times Bestseller Of The Same Name Executive Produced By Derek Cianfrance, Ben Browning, Glen Basner, Mark Ruffalo, Gregg Fienberg, Lynette Howell Taylor, Wally Lamb And Anya Epstein; Jamie …