Professor Schulenberg published widely on topics related to psychosocial development from adolescence through adulthood. He proposed conceptual models of how common developmental transitions in work, relationships, and achievement across adolescence and the transition to adulthood set the stage for differential trajectories in health and well-being across the life course. His scholarly career brought a developmental perspective to theory and research on substance use and psychopathology, while also bringing a broad population perspective using large-scale survey data to developmental psychology. He enjoyed collaborating and mentoring and viewed supporting early- and mid-career scholars as a key part of his contribution to the field. Professor Schulenberg will be remembered for his devotion to formally and informally mentoring dozens of scholars, enthusiasm for interdisciplinary collaboration, and passion for developmental science.