The international expansion of law firms plays a critical role in understanding the business of law and the nature of globalization. This article responds to two articles on law firm expansion in the Indiana University - Bloomington Law School symposium on the Globalization of the Legal Profession. The article utilizes management studies\u27 theoretical work on internationalization and applies it to law firm expansion to explain law firm strategic decision-making. The author creates a six part taxonomy for types of law firm expansion and provides a snapshot of the increasing U.S./U.K. dominance of capital markets, corporate and mergers and acquisitions legal work around the world. Finally, the article proposes an interdisciplinary research agenda that incorporates law, economics, sociology, economic geography, and management studies to better understand law firm expansion