Armstrong Teasdale

Armstrong Teasdale

Armstrong Teasdale LLP, based in Clayton, Missouri, is one of the state’s largest law firms. With nearly 250 lawyers located throughout the United States and China. Armstrong Teasdale is a full-service firm with main practice areas in corporate services, financial services, intellectual property, international, litigation and real estate. It has had the largest patent practice in the St. Louis area, according to the St. Louis Business Journal, and Armstrong Teasdale was recognized by Intellectual Property Today magazine as one of the “2010 Top Patent Firms” in the country. We became the first Missouri law firm named to the list in 2009.

Reflecting its growing representation of cutting edge technology clients, the firm moved its headquarters in 2010 to a state of the art, “green” building located in the St. Louis suburb of Clayton. "Being green" is a distinguishing aspect of Armstong Teasdale's culture and the United States Environmental Protection Agency recently recognized the firm as a Green Power Partner for its significant purchase of Renewable Energy Certificates.

Armstrong Teasdale is a member of Lex Mundi, a global association of 160 prominent law firms, United States Law Firm Group, a network of law firms located in major U.S. cities; and State Law Resources, Inc., an organization of firms with expertise in administrative, regulatory, and government relations at the state and federal levels.