Scholarly analyses of Catharine MacKinnon’s influence on US jurisprudence regarding sexual harassment focus almost exclusively on Title VII law. Little attention has been paid to Title IX and Alexander v. Yale, wherein lawyers for the plaintiffs used her theories to argue—successfully—a bold claim: that sexual harassment within educational institutions was sex discrimination, and thus violated Title IX. Moreover, little scholarly work on MacKinnon’s influence is substantiated by a close reading of court documents. In this article, I address these gaps by pairing an examination of documents from Alexander v. Yale with an explication of the philosophical distinctiveness of MacKinnon’s theories regarding sexual harassment to argue that her theories played a substantial role in this legal victory. Contextualising the legal documents and MacKinnon’s writings within a consideration of the origins of Title IX allows for a renewed and more firmly established understanding of her substantial contribution to US jurisprudence.

关于凯瑟琳·麦金农对美国性骚扰法学影响的学术分析几乎完全集中在第七章法律上。《第九条》和亚历山大诉耶鲁案很少受到关注，其中原告律师利用她的理论成功地提出了一个大胆的主张：教育机构内的性骚扰是性别歧视，因此违反了《第九条》。此外，关于麦金农影响力的学术著作几乎没有通过仔细阅读法庭文件得到证实。在本文中，我通过对亚历山大诉耶鲁案的文件进行审查，并结合对麦金农有关性骚扰的理论的哲学独特性的解释来解决这些差距，以证明她的理论在这场法律胜利中发挥了重要作用。将法律文件和麦金农的著作放在考虑第九条起源的背景下，可以使人们对她对美国法学的重大贡献有新的、更牢固的理解。