In Reply In a Letter to the Editor, Odom insightfully notes that school mobility is an understudied factor that may influence adolescent health by disrupting adolescent social networks and reducing their social capital. Alternatively, mobility may be a marker for risky behaviors, as students often change schools because of academic or behavioral difficulties. In the Reducing Inequities Through Social and Educational Change Follow-up (RISE Up) Study,1 we found that students who won the admissions lottery and were offered a spot in a high-performing charter school were less likely than lottery losers to engage in substance use and also less likely to change schools during the study period. Odom is correct that we looked only at whether students moved schools and not the type of move. However, because we examined school mobility as an outcome, this variable definition choice did not affect the analyses of any other outcomes.