large racially and ethnically diverse sample of early adolescents, we extend this previous research by documenting that emotion dysregulation mediated the longitudinal associations of both peer victimization and stressful life events with increases in aggression for both males and females. These findings build on previous work documenting the role of emotion dysregulation as a mechanism linking stress exposure to internalizing psychopathology (McLaughlin et al. 2009, 2011).