There is widespread concern that economics does not attract as broad or diverse a pool of talent as it could. For example, less than one-third of undergraduates who receive degrees in economics are women, significantly lower than in math or statistics. This article presents a case study of a new introductory undergraduate course at Harvard, “Using Big Data to Solve Economic and Social Problems,” that enrolled 400 students, achieved nearly a 50-50 gender balance, and was among the highest-rated courses in the college. We first summarize the course’s content and pedagogical approach.