Anthony D. Ong, PhD, is an associate professor of human development at Cornell University. He received his PhD from the University of Southern California. His research broadly focuses on individual differences in developmental plasticity or the capacity of individuals to flexibly adapt to changing life circumstances with age. A major focus of his recent work involves expanding basic understanding of the behavioral and biological pathways by which positive emotions, interpersonal relationships, and cultural experience contribute to diverse health outcomes in later adulthood. His research has been supported by the National Institute of Aging.   Corinna E. Löckenhoff, PhD, is an associate professor of human development at Cornell University. She received her undergraduate degree from the University of Marburg, Germany, and her PhD from Stanford University. Her National Institutes of Health-funded research examines age differences in personality and emotions and their influence on health-related decisions, behaviors, and outcomes. A central goal is to optimize health care choices across the lifespan. Another line of her research examines lifelong trajectories in personality traits and their relation to mental and physical health.