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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Zachary P. Armstrong

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Terri Gruneberg

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Zack is an associate attorney in DeWitt’s Litigation, Intellectual Property Litigation, and Transportation & Logistics Practice Groups. His practice focuses on general civil litigation with experience with patent litigation, trade secret litigation, false advertising, commercial litigation, real estate litigation, transportation & logistics litigation, and personal injury matters.  He also has experience in business and commercial transactions.

Zack started with DeWitt as a law clerk in 2017.  While in law school, Zack clerked for the Hennepin County Attorney’s Office in the Community Prosecution division where he prosecuted felony and misdemeanor cases while gaining trial and other courtroom experience as a certified student attorney. During his time in the University of St. Thomas’s Elder Law Practice Group Clinic, he represented a client during a bench trial in Hennepin County Probate Court. Zack earned Dean’s Awards for his performance in White Collar Crime & Compliance, Business Planning, Banking Law, and Legal Writing.

Awards & Recognitions

  • Dean’s Award in White Collar Crime & Compliance, Business Planning, Banking Law, and Lawyering Skills II



  • Former Managing Editor of the University of St. Thomas Law Journal – University of St. Thomas School of Law


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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


While we would like to hear from you, we cannot represent you until we know that doing so will not create a conflict of interest. Accordingly, please do not send us any information about any matter that may involve you until you receive a written statement from us that we represent you (an “engagement letter”). You will not be a client of the firm until you receive such an engagement letter.

The best way for you to initiate a possible representation is to call DeWitt LLP at 608-255-8891. We will make every effort to put you in touch with a lawyer suited to handle your matter. When you receive an engagement letter from one of our lawyers, you will be our client and we may exchange information freely.

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