Michael Mullen is a partner in Armstrong Teasdale’s Litigation practice group, where he focuses on arbitration, mediation, special master work and general trial work.

He has more than three decades of diverse legal experience including roles on the bench, in private practice, and as an assistant circuit attorney for the city of St. Louis. Most recently, serving as a circuit judge in the Missouri 22nd Judicial Circuit Court, Michael presided over a number of high-profile, multi-week and multimillion-dollar trials.

Michael brings his in-depth insight into the workings of the court to his client representations, having tried hundreds of cases and presided over countless others, both bench and jury trials, involving felonies as well as high-value civil disputes. He has rendered dozens of opinions described as well-reasoned and adhering closely to precedent as well as to constitutional and statutory law.

During his time on the court, Michael established St. Louis’ Criminal Justice Coordinating Council, comprised of intergovernmental agency leaders working to enhance public safety through coordinated decision-making; and the city’s felony redirect program, allowing people with low-level felonies to enter alternative rehabilitation programs.

A sought-after speaker and panelist, Michael has appeared at national mass tort conventions as well as the Missouri Organization of Defense Lawyers, Missouri Association of Trial Attorneys, the Bar Association of Metropolitan St. Louis Bench and Bar conference, and numerous CLE programs.


Prior to joining Armstrong Teasdale, Michael was a circuit judge in the Missouri 22nd Judicial Circuit Court from 2008 to 2023. He presided over the mass tort docket for the city of St. Louis and, from 2017-2018, he served as presiding judge over the 22nd Circuit. He joined the court as an associate circuit judge in 2001.

Before that, Michael was in private practice at several St. Louis area law firms, and previously worked as an assistant circuit attorney with the St. Louis Circuit Attorney’s Office. He has also taught criminal law as an adjunct professor at the University of Missouri-St. Louis.

Immediately following law school, Michael clerked for the Hon. James A. Pudlowski in the Missouri Court of Appeals for the Eastern District.


  • University of Missouri-Columbia  (J.D., 1989)
  • University of Missouri-Columbia  (A.B., 1986)


  • Missouri
  • U.S. District Court, Eastern District of Missouri

Professional Activities

  • The Missouri Bar
  • Bar Association of Metropolitan St. Louis (BAMSL)
  • The Lawyers Association of St. Louis
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