I sat down with Christiane Tietz to discuss the challenges and rewards of writing a biography of Karl Barth, and what theology gains from biography. We discuss Barth's time as a pastor in Safenwil and his siding with factory workers in a local labour dispute, and I ask how this event influenced (or was shaped by) his understanding of the kingdom of God and whether she feels this commitment to the vision of heaven come to us as an impetus to support socialism lasts throughout Barth's life or was more of a youthful passion. We then discuss Barth's relationship with Charlotte von Kirschbaum, the tensions between Karl and Nelly, and the various pulls and pushes that led to all three under one roof. In particular I ask what responsibility did she feel in approaching this material. Finally, we talk about Barth's feelings toward the CD toward the end of his days, and, (perhaps relatedly) how he might have felt about the modest publishing industry the CD still sustains.