Assistant principals (APs) are important education personnel, but empirical evidence about their career outcomes remains scarce. Using administrative data from Tennessee and Missouri, we provide the first comprehensive analysis of AP mobility. While prior work focuses on promotions into principal positions, we also examine APs exiting school leadership and transferring across schools. We find yearly mobility rates of 25% to 28%, with 10% of APs leaving school leadership, 7.5% changing schools, and 7.5% to 10% becoming principals. We also document a strong relationship between AP mobility and principal turnover, where higher-performing APs are substantially more likely to replace their departing principal. Finally, principal transitions appear to increase the likelihood that APs exit school leadership and change schools.

助理校长（AP）是重要的教育人员，但是关于其职业生涯结局的经验证据仍然很少。利用田纳西州和密苏里州的行政数据，我们提供了对AP流动性的首次全面分析。尽管先前的工作重点是晋升为主要职位，但我们还研究了退出学校领导并跨学校转移的AP。我们发现每年的流动率为25％到28％，其中10％的AP离开了学校领导，7.5％的学校更换了，而7.5％到10％的是校长。我们还记录了AP流动性与委托人流动性之间的密切关系，其中性能较高的AP基本上更有可能替换其离任的委托人。最后，校长过渡似乎增加了AP退出学校领导并更换学校的可能性。