This work is a study of Reformed philosophy at the time of its emergence in the Netherlands in the 1920s, as founded by Dirk Vollenhoven and Herman Dooyeweerd. Vollenhoven provided the framework for critical discussion of influential neo-Kantian themes within their intellectual milieu and of protestant scholasticism within the tradition of the Reformation. The Reformed philosophy that took shape is usually attributed to Dooyeweerd. But Vollenhoven's role calls for more open recognition. Not only did he maintain a distinct position on important issues, his initial framework also influenced the subsequent understanding of Reformed philosophy.