David W. Braswell, chairman[2] Armstrong Teasdale is a partner-owned law firm headquartered in St. Louis, Missouri.

[6][7] In 1989, it merged with Dietrich, Davis, Dicus, Rowlands, Schmitt & Gorman, which became the firm's Kansas City office.

[11][12] Shortly afterward, Armstrong Teasdale expanded its east coast operations with new offices in Utah, New York, New Jersey, Illinois, and Massachusetts.

[4] Armstrong Teasdale has also done several high-profile personal injury and product liability cases on both the defense and plaintiff side.

[19] And in 2020, it earned a $386 million contract for biotech intellectual property work for the National Institutes of Health.