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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Dennis P. Birke

Martha Olson

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Dennis is an accomplished attorney with more than 20 years of complex regulatory and litigation experience in areas that include environmental, energy, insurance and business law.  He is a seasoned litigator with a track record of success in state and federal trial and appellate courts and before administrative agencies.

He also counsels clients on regulatory compliance, permitting and remediation issues as well as environmental due diligence in corporate, real estate, and lending transactions. Dennis regularly works with clients buying and selling real estate and manufacturing/industrial facilities to investigate and address environmental risks.

A repeated recipient of Wisconsin Best Lawyers® and Super Lawyers® awards, he is also an active community leader, having served as President of two high-profile Madison community organizations. Dennis currently serves as Chair of the firm's Environmental Practice Group.

Notable Representations

  • Successfully represented a client in a lawsuit against multiple insurers who denied coverage for an environmental claim involving hundreds of millions of dollars. A jury verdict in favor of the client was affirmed on appeal. 
  • Currently representing the same client in federal court litigation over PCB contamination at one of the country’s largest environmental site remediation projects. Secured a court ruling holding that the client is not liable for site cleanup costs under the federal Superfund law.
  • Successfully represented an energy company in proceedings before the Public Service Commission of Wisconsin to secure permits and approvals necessary for the construction of an electric generating facility.
  • Represented a group of electric cooperatives named as potentially-responsible parties (PRPs) at an abandoned metal reclaiming site contaminated with PCBs. Served as lead counsel for the PRP group and successfully negotiated an innovative voluntary cost-sharing agreement that spread cleanup costs among numerous parties.
  • Represented a major telecommunications firm in various regulatory proceedings before the Public Service Commission of Wisconsin and in federal and state courts.
  • Served as environmental counsel for clients selling complex industrial facilities, including a petroleum refinery and a manufacturer of metal and plastic nameplates with facilities at multiple sites. Managed the due diligence investigations and complicated permit transfer issues.
  • Defended two companies in state and federal court lawsuits seeking to recover landfill remediation costs. Secured judgments in both actions dismissing all claims against one of the clients. Negotiated a settlement of the claims against the other client and then successfully represented that client in recovering most of the cost of the settlement from its insurers.
  • Represented the owner of a former manufactured gas site which was undergoing extensive environmental remediation.


  • Best Lawyers® – Lawyer of the Year 2016 - Communications Law
  • Wisconsin Super Lawyer – Law & Politics Magazine
  • Best Lawyers® – The Best Lawyers in America - Communications Law, Energy Law, Environmental Law - Since 2007
  • Top Attorneys in Wisconsin

Our Locations


Two East Mifflin Street, Suite 600
Madison, WI 53703
(608) 255-8891
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Greater Milwaukee

13935 Bishop's Drive, Suite 300
Brookfield, WI 53005
(262) 754-2840
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1400 AT&T Tower,
901 Marquette Avenue
Minneapolis, MN 55402
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Get to know us

DeWitt Ross & Stevens S.C., including its affiliate DeWitt Mackall Crounse & Moore S.C., is one of the ten largest law firms based in Wisconsin, with an additional presence in Minnesota. It has nearly140 attorneys practicing in Madison, Metropolitan Milwaukee and Minneapolis in over 30 legal practice areas, and has the experience to service clients of all scopes and sizes.

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We are an active and proud member of Lexwork International, an association of midsized independent law firms in major cities located throughout the Americas, Europe and Asia.


Best Lawyers 2013 - 2016
Compass Award 2012
Top 100 Lawyers: National Trial Lawyers Association

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