The Integrative Graduate Education and Research Traineeship (IGERT) program represents a substantial investment by the National Science Foundation (NSF) to improve the quality of graduate education, and ultimately, to increase the number of graduates better prepared to address the nation‘s 21st century scientific and technological needs. The current study focuses on the program‘s goal of educating Ph.D.-level scientists to develop the depth and breadth of knowledge and skills to become leaders in their respective fields; it does so by exploring how IGERT grantees are conceptualizing and delivering interdisciplinary doctoral training.