Firm Overview

For more than a century, Armstrong Teasdale LLP has forged long-term relationships with clients large and small around the globe. With roots in the Midwest and offices across the country, Armstrong Teasdale is perfectly positioned to provide Lex Mundi member firms and clients innovative legal services. The firm is structured into four core practice groups: corporate services, financial and real estate services, intellectual property and litigation. Our attorneys work together to guide clients through virtually every challenge, from day-to-day operational decisions to some of the most complex legal matters.

With dozens of key practice areas and industry teams, our firm has the ability to provide services of scale, encompassing both traditional and niche fields such as agribusiness and food, complex commercial litigation, manufacturing, technology, public finance and municipal law, fire and electrical liability, health care and life sciences, higher education, noncompete, security clearance and privacy and data security.

Our intellectual property practice is one of our fastest growing and litigators in this practice have garnered high-profile courtroom successes. The St. Louis Business Journal has named our patent practice the largest in St. Louis for the past 12 years.

As an AmLaw 200 law firm, Armstrong Teasdale serves a broad client base including global and Fortune 500 companies. We also have the following subsidiaries: AT Government Strategies provides government relations and strategic counsel to advance the business objectives of companies, industry associations and other entities; Development Dynamics (“D2”), which provides an array of economic development advisory services; and LAWgical Choice, which uses advanced technology to organize and present relevant case information in a targeted, trial-ready format.


• Received multiple first-tier metropolitan rankings in the 2019 edition of the U.S. News & World Report and Best Lawyers list of “Best Law Firms.”

• The 2019 edition of Chambers USA: America’s Leading Lawyers for Business ranked 18 Armstrong Teasdale attorneys as leading lawyers in their respective practice areas.

• Received the highest possible score on the 2019 Corporate Equality Index, a national benchmarking survey and report on corporate policies and practices related to lesbian, gay, bisexual and transgender workplace equality. The survey is administered by the Human Rights Campaign Foundation, an arm of the largest LGBT civil rights organization in the United States.

• The National Law Review recognized Armstrong Teasdale with a 2018 Go-To Thought Leadership Award for our breadth of litigation coverage.

Armstrong Teasdale LLP
7700 Forsyth Boulevard
Suite 1800
St. Louis, Missouri 63105-1847
Tel 1.314.621.5070
Fax 1.314.621.5065

Firm Contacts
Other Offices
  • Armstrong Teasdale LLP

    4643 S. Ulster St.
    Suite 800
    Denver, Colorado 80237
    Tel. 1.720.200.0676
    Fax 1.720.200.0679
  • Armstrong Teasdale LLP

    23 South First Street
    Belleville, Illinois 62220
    Tel. 1.618.397.4411
  • Armstrong Teasdale LLP

    12980 Foster, Suite 370
    Overland Park, Kansas 66213
    Tel. 1.913.345.0706
    Fax 1.913.345.1802
  • Armstrong Teasdale LLP

    3405 West Truman Boulevard
    Suite 210
    Jefferson City, Missouri 65109-5713
    Tel. 1.573.636.8394
    Fax 1.573.636.8457
  • Armstrong Teasdale LLP

    2345 Grand Boulevard
    Suite 1500
    Kansas City, Missouri 64108-2617
    Tel. 1.816.221.3420
    Fax 1.816.221.0786
  • Armstrong Teasdale LLP

    3770 Howard Hughes Parkway
    Suite 200
    Las Vegas, Nevada 89169
    Tel. 1.702.678.5070
    Fax 1.702.878.9995
  • Armstrong Teasdale LLP

    919 Third Ave., 37th Floor
    New York, New York
  • Armstrong Teasdale LLP

    1500 Market Street
    Philadelphia, Pennsylvania 19102

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