In addition to my primary research specialty in Ottoman history, I prepared to teach the history of the Islamic Middle East from my first year in graduate school onward, and I did so throughout my academic career, including preparing graduate students to teach Ottoman and modern Middle Eastern history. My start in world history came later. Around the time I got tenure, my department decided, for comically bad reasons, to create a single world history course on the twentieth century. Having never witnessed creation ex nihilo in a department meeting before, I volunteered for the course. The department's reasons for creating the course were farcical, but I recognized it as a valuable intellectual property. In the existing state of the pedagogical literature, no one had paused to analyze the issues that made the twentieth century into more than the last chapter of a comprehensive world history book. A couple of years later, just as we finished teaching the course for the first time, an editor came along and asked if I had ever thought about writing a textbook. Yes, I had thought about it. Only I had assumed many years would pass before anyone would ask. Such were the origins of my coauthored Twentieth-Century World, having gone through seven editions from 1986 until 2010. It would be an understatement to say that radical revisions were required for each new edition, given not only the lengthening chronology but also the often radical revisions and improvements in the literature. If this presentation sounds more like a memoir than a research paper, the reason is that my dual lives in Middle Eastern and world history interacted in the pedagogical realm, raising issues that redirected my basic research and theoretical inquiries along the way.