One of the most frequent questions we get about our book, The Progress Principle, isn’t about the content of the book or the research behind it. Rather, it goes something like this: “You guys wrote a book together, and you’re still married?!” Well, yes, we did, and yes, we are — for 23 years. Inevitably, that leads to questions about what it was like to work so closely together and how we managed it without ruining our marriage. Our glib answer is that it was “the best of times and the worst of times.” The best: sharing the excitement of discovery, developing new ideas, and realizing that it was all coming together (sometimes celebrated by a running-leap high five between 5’2″ Teresa and 5’11” Steve). The worst: agonizing over our disparate interpretations of the data during long dinner-table discussions until our daughter begged, “Can we please talk about something else now?”