Mackall, Crounse & Moore, PLC has joined Dewitt Ross & Stevens S.C.

The newly formed DeWitt Mackall Crounse & Moore S.C. will provide clients with enhanced legal services
and efficiencies as well as access to more than 100 attorneys practicing in nearly 30 areas of
law in Wisconsin and Minnesota.

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Mark G. Ohnstad

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Debby Schumacher

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Mark’s primary area of practice is civil litigation. He has handled cases from conciliation court to the U.S. Supreme Court. He has tried hundreds of cases over his more than 40 years of practice.

His cases involve a wide variety of areas of law and facts, including bankruptcy, construction, copyright, discrimination (sex, race, age), employment, family law, franchises, guardianships, insurance, international law, personal injury, professional malpractice (medical, dental, legal), probate, retirement plans, securities (federal, state), trusts, and wills.

He has been an arbitrator, mediator and volunteer judge for Hennepin County, Minnesota. He enjoys novel, complex and interesting matters.

He also does some transactional work, including intellectual property, real estate and corporate matters. He has found his litigation experience helpful in other areas of the law.

He distinguishes himself with the careful analysis and knowledge he brings to each matter. He comes from a family of lawyers (father, uncle, and daughter) and puts the best interests of the client first.

Notable Representations

  • He represented a large, well-known national organization in a high-level federal case involving the First Amendment right to associate.

  • He represented a medium size supplier in a construction case which has been referred to by legal authors over 160 times. National Hydrosystems v. M.A. Mortenson Co., 529 N.W.2d 690 (Minn. 1995).

  • He represented a homeowner in a case which reversed the trial court’s decision and protected the homeowner from an improper construction lien. Niewind v. Carlson, 628 N.W.2d 649 (Minn. Ct. App. 2001).

  • He represented an author in a federal copyright case which established a new legal principle in Minnesota protecting copyright holders. Tri-Marketing, Inc. v. Mainstream Marketing Services, Inc., No. CV-09-13, 2009 WL 1408741 (D. Minn. May 19, 2009)

  • He drafted a contract for a client involving intellectual property which has a stated term of 100 years.

  • He has represented clients regarding litigation in Australia, Costa Rica, Europe, Mexico, and New Zealand.

  • He still represents his first client, a cooperative buying association.

Articles & Presentations

  • Going to Court - An Overview, March 2021

  • General Points of Law Re Employment Matters in Minnesota, October 2013

  • Before you Divorce, Make Plans for your Insurance Needs,, January 2013

  • How to Write Non-Competes to Close Loopholes, Upsize Magazine, June 2007

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Get to know us

DeWitt LLP is one of the ten largest law firms based in Wisconsin, with an additional presence in Minnesota. It has more than 130 attorneys practicing in Madison, Greater Milwaukee, Green Bay and Minneapolis in over 30 legal practice areas, and has the experience to service clients of all scopes and sizes.


We are an active and proud member of Lexwork International, an association of mid-sized independent law firms in major cities located throughout the Americas, Europe and Asia and an active member of SCG Legal, an association of more than 140 independent law firms serving businesses in all 50 state capitals and major commercial centers around the world.


Best Lawyers 2013 – 2021
Super Lawyers 2021
Compass Award 2012
Top 100 Lawyers: National Trial Lawyers Association


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