Our interest in understanding how friends shape adolescents’ career aspirations evolved from our background in studying children’s gender development. Children’s peers play a critical role in socializing adherence to gender-role norms. Indeed, many gender-sensitive parents are dismayed to realize that their attempts to raise gender-flexible children are undone soon after their children begin interacting with peers at school. Among other things, children’s peers are responsible for transmitting messages about what types of academic pursuits are appropriate for girls and boys.