“Very soon after the Sandy Hook School shooting, where I lost my 7-year-old son Daniel, I felt a sense of purpose and mission to try use this voice that had been forced upon me to try to affect change,” Mark Barden explains of his role in “Newtown.” He and his family worked closely with the film’s producers Kim A. Snyder and Maria Cuomo-Cole to capture the collective grief and trauma that impacts an entire community in the wake of gun violence. The Independent Lens documentary was honored with a 2017 Peabody Award “for a compassionate presentation of one of the darkest days in American history, and for demanding action to stop such shootings.”