Mark Seigel
Hon. Mark Seigel Neutral
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Mark Seigel

Judge Seigel has been mediating and arbitrating since 2014, handling cases of all types. He was a circuit judge, St. Louis County 21st Judicial Circuit, in 1994-2014; a partner in a Clayton, MO law firm engaged in general practice of law including plaintiff’s and defense cases in 1974-1994; and a member of a firm engaged in general practice of law in 1970-1974. In private practice, Judge Seigel tried numerous civil cases of all kinds; he also has presided over and settled thousands of cases ranging from disputes involving product liability, premises liability, and medical malpractice to automobile accidents, wrongful death and probate and trust cases. He has also presided over and resolved cases involving corporations, partnerships, joint ventures, sole proprietorships, commercial contracts, employment agreements, fraud, insurance coverage, real estate, and construction.


  • Advanced Mediation Training, USA&M 2014
  • University of Missouri School of Law Mediation Training 2008
  • Washington University School of Law J.D. 1969
  • University of Missouri-Columbia B.J. 1966

Professional or Trade Affiliations

  • Bar Association of Metropolitan St. Louis
  • St. Louis County Bar Association
  • Lawyers Association of St. Louis
  • The Missouri Bar