Belleville: 618-234-9800 | Edwardsville: 618-656-2244 | ST. LOUIS: 314-421-2325
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Legal Assistant: Karen Weinland



  • Saint Louis University – J.D. 1982
  • Northern Illinois University – B.S. in Accounting 1979


  • Certified Public Accountant (CPA)

Legal Services

Bar Admissions

  • Illinois
  • Missouri

Court Admissions

  • United States Tax Court

Mark J. Stegman


Mark J. Stegman is a shareholder with Mathis, Marifian & Richter, Ltd.  who concentrates his practice in business law, taxation, real estate law, and estate planning. Mark has more than 40 years’ experience providing general counsel to closely-held businesses and their owners. His work is focused on a variety of corporate transactions, including corporate reorganizations, mergers and acquisitions, stock redemptions, succession planning and buy-sell arrangements. He also has substantial experience handling federal and state tax audits and appeals, as well as commercial loan transactions.

Mark represents a wide range of clients, including retailers, wholesalers, automobile dealerships, bankers, manufacturers, distributors and other business clientele. Before joining MM&R in 1996, Mark spent 13 years with two large law firms located in the St. Louis area. As a Certified Public Accountant (CPA), he also spent three years with a large accounting firm in St. Louis. Mark’s experience, along with his background as a CPA, has provided him with an unusual depth and breadth of experience in solving strategic and operational problems for clients.

Professional Affiliations

Mark is currently a member of the Illinois State Bar Association and The Missouri Bar. In 2018, Mark was Peer Rated for Highest Level of Professional Excellence by Martindale-Hubbell for his high ethical standing.

Community Involvement