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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Aaron M. Ninnemann

Green Bay
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Attorney Aaron M. Ninnemann is a civil litigation and trial attorney at our Green Bay office. Aaron represents businesses and individuals in a variety of matters and practice areas, including real estate, construction law, employment law, shareholder disputes, product liability, and other commercial disputes. He also handles appeals in state and federal courts.  Aaron also serves as outside legal counsel to small businesses.

Prior to joining our firm, Aaron was a civil litigation attorney for four years in Minneapolis, Minnesota. When not in the courtroom Aaron enjoys playing golf, men’s league hockey, and spending time with his wife and daughter.

Notable Representations

  • Earned a reversal of a circuit court’s judgment granting a motion for summary judgment in favor of a property owner in construction lien foreclosure case which involved issues of first impression for the Wisconsin Court of Appeals and constructive notice under Wisconsin’s construction lien law. Following remand, secured a $650,000.00 judgment after a three day court trial. 
  • Earned defense verdict after jury trial in agricultural construction litigation involving claims of defective design and construction of calf barn.
  • Won jury trial in dispute between members of limited liability company involving claims of embezzlement.
  • Earned reversal from Wisconsin Court of Appeals in a securities fraud case after circuit court granted defendants’ motion for summary judgment.
  • Successfully obtained a damages award of over $250,000.00 following a four-day jury trial in a construction lien and defects matter.

Our Locations

Greater Milwaukee - Get Directions

Green Bay - Get Directions

Madison - Get Directions

Minneapolis -Get Directions


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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