Armstrong Teasdale is a national law firm established in 1901 and headquartered in Saint Louis, Missouri. The firm fields more than 200 practicing lawyers across 11 offices, serving clients worldwide. Its practice areas include litigation, dispute resolution, intellectual property, corporate law, environmental law, mergers and acquisitions, bankruptcy, private equity, venture capital, and cannabis and hemp law, with additional services in patent and trademark work. Industry focus spans aerospace and defense, technology, healthcare, financial services, real estate, fashion and cosmetics, mining, media, and life sciences. Armstrong Teasdale emphasizes client relationships, innovation, and diversity, evidenced by Mansfield Rule certification. The firm serves clients in various sectors and emphasizes comprehensive, career-long client service and results in both the boardroom and the courtroom.