Ruben has mainly published in German, but just this past year, Fortress published (what I believe is) his first English book, Puzzling the Parables of Jesus: Methods and Interpretation. I haven't read this yet. I'm supposed to be reviewing it for a journal and they have yet to send the book. But I've heard great things about it and am eagerly anticipating it, not the least because he supposedly take a "memory approach" in it. This study will undoubtedly inform his presentation, and I'm told that he will engage critically with John P. Meier's recent volume of A Marginal Jew, which similarly focuses upon parables.
If you'd like to hear Ruben's paper and then drink a beer with him at dinner, join us at the conference by registering here.