Firm Overview

With our deep Missouri roots, Armstrong Teasdale LLP is perfectly positioned to provide Lex Mundi member firms and clients innovative legal services that reflect an in-depth understanding of their business realities in four core areas: corporate services, financial and real estate services, intellectual property and litigation.

Our key practice groups encompass both traditional and progressive niche fields including fire and electrical liability, health care, franchising, higher education, noncompete, security clearance, data security and social media. With an Asian office based in Shanghai that maintains close contacts with regional Lex Mundi firms, Armstrong Teasdale offers strong international capabilities to clients operating in that area of the world. Through our membership in the China Alliance, a group of three Lex Mundi law firms, we help clients succeed in China.

Our intellectual property team is our fastest growing group and litigators in this practice have garnered significant high-profile courtroom successes. The St. Louis Business Journal has named our patent practice the largest in St. Louis for the past nine 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 Environmental, LLC, which helps clients reduce environmental risks; 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. In addition, the firm is an investor in Selequity, which provides an online platform for accredited investors to find and invest in commercial real estate projects.


• Received multiple first-tier metropolitan rankings in the 2017 edition of the U.S. News & World Report and Best Lawyers list of “Best Law Firms.”

• The 2016 edition of Chambers USA: America’s Leading Lawyers for Business ranked 23 Armstrong Teasdale attorneys as leading lawyers in their respective practice areas.

• Received the highest possible score on the 2016 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.

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

    1376 Nan Jing Xi Lu
    Shanghai Centre, Suite 718
    Shanghai, 200040
    Tel. 86.21.6279.8808
    Fax 86.21.6279.8866
  • 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
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