With volume 4 the T2M Yearbook has graduated from its initial three-year experimental phase. We can now speak of our Yearbook’s history and its traditions—among them relentless pursuit of historiographical reviews about mobility scholarship in countries that too often escape attention elsewhere, unusual thematic reviews that offer new perspectives on historical mobility studies, and more personal, retrospective assessments of the contributions of leading scholars and classic works. The 17 peer-reviewed articles in this year’s Yearbook are faithful to these traditions.