Belleville: 618-234-9800 | Edwardsville: 618-656-2244 | ST. LOUIS: 314-421-2325
Email  |  Download vCard  |  Download PDF Bio
Legal Assistant: Courtney Hoffmann



  • Washington University, St. Louis – J.D. 1986
  • University of Missouri, St. Louis – B.S.B.A. 1982

Legal Services

  • Commercial & Civil Litigation
  • Personal Injury
  • Construction
  • Business Disputes
  • Trust – Will Disputes
  • Class Actions
  • Appellate Practice
  • Medical Malpractice

Bar Admissions

  • Illinois
  • Missouri

Court Admissions

  • Seventh Circuit Court of Appeals
  • United States District Court for the Southern District of Illinois
  • United States District Court for the Central District of Illinois
  • United States District Court for the Eastern District of Missouri
  • United States Tax Court

William J. Niehoff


William J. (Bill) Niehoff is Vice President and Shareholder at Mathis, Marifian & Richter, Ltd. who focuses his practice in commercial and civil litigation, personal injury litigation, and construction and contract disputes.

Bill has practiced for more than 30 years representing a wide range of local and international clients in significant matters involving class actions, product liability, personal injury, employment agreements, contract disputes and construction litigation. Since joining MM&R in June 2000, Bill has worked cases that have returned commercial settlements, civil settlements and judgments for his clients in excess of $50 million. He has represented both plaintiffs and defendants in state and federal courts in a wide range of jurisdictions, including Illinois, Missouri, Texas, Mississippi, Louisiana, Oklahoma, Wisconsin and West Virginia. He has also represented clients before the Missouri Public Service Commission, the Illinois Commerce Commission, the Federal Energy Regulatory Commission, the Securities and Exchange Commission and the United States Tax Court. Bill has represented automobile manufacturers, national and international manufacturers, hospitals, physicians, railroads, utilities, large and small business owners, and individuals.

Over the course of his career, he has also assisted in the reorganization and formation of holding companies for several of the largest Midwestern energy companies as well as developing and implementing regulatory compliance programs for energy companies.  Bill has acted as outside general counsel for growing companies assisting in all facets of legal services. Bill is also the author of Chapter 7 on product defect in Illinois Products Liability published by Lawyers Cooperative Publishing.

Professional Affiliations

Bill is licensed in Illinois and Missouri and is admitted to practice before the United States District Courts for the Southern District of Illinois, the Eastern District of Missouri and the Central District of Illinois, Appellate Courts of Illinois and Missouri, the Illinois and Missouri Supreme Courts and the Seventh Circuit Court of Appeals. Bill is a member of the American Bar Association, Illinois Bar Association, The Missouri Bar, the St. Clair County Bar Association, and the Bar Association of Metropolitan St. Louis. He is an accomplished author and speaker, and has testified before the Missouri General Assembly on electric deregulation issues.

Bill is recognized as a Leading Lawyer, a distinction held by less than 5% of attorneys, in his practice areas of personal injury, commercial law and litigation.

Practice Highlights