Kevin Kling is a performer and an advisory council member of Interact. His plays include “21A” and “Lloyd’s Prayer.” His books include “The Dog Says How.” The new PBS documentary about his life and work is called “Kevin Kling: Lost and Found.” This interview is edited and produced with music and other features in the On Being episode “Kevin Kling — The Losses and Laughter We Grow Into.” Find more at onbeing.org.