Mathematics educators have been publishing their work in international research journals for nearly 5 decades. How has the field developed over this period? The authors analyzed the full text of all articles published in Educational Studies in Mathematics and the Journal for Research in Mathematics Education since their foundation. They quantitatively assess the extent of the “social turn,” observe that the field is currently experiencing a period of theoretical diversity, and identify and discuss the “experimental cliff,” a period during which experimental investigations migrated away from mathematics education journals.