Robert M. Doran, who died in early 2021, made prolific and important contributions to Lonergan studies, especially arguing for some creative innovations and practical applications. Notably, he integrated a psychological component into Lonergan’s notion of conversion. Moreover, his vision for Catholic theology was global, and he sought creatively to engage the tradition with the complex contemporary situation. Doran’s intellectual developments can be divided into four areas: (1) the early work up to his tome Theology and the Dialectics of History, (2) the turn to systematic theology, (3) the implementation of a systematics, and (4) hermeneutic innovations of Lonergan’s thought. The first three are chronological, but this article will also highlight key innovations of Lonergan’s thought from Doran’s intellectual development along the way.