“…As life course epidemiology grew in popularity, however, many researchers began to explore HRSBs using life course constructs, including trajectories of HRSB across developmental stages [Fergus, Zimmerman, & Caldwell, 2007] and the role of sensitive periods for certain environmental inputs, such as father absence [Ellis et al, 2003]. Several large, seminal studies sought to understand the full scope of the interactions between various sociodemographic characteristics, life circumstances, and comorbid risky behaviors in adolescence and adulthood (i.e., co-occurring risky sex, substance use, delinquency, and violence), leading to a reconceptualization of which levers are most effective in promoting healthy development across these domains [Bailey, 2009] [Reider, Robertson, & Sims, 2014]. This example illustrates the power of using a life course theory approach to studying and intervening in health promotion during a life transition, using interdisciplinary insights and theories.…”