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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Heather L. Kierzek

Greater Milwaukee
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Anastasia Tsiantou

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Heather is an associate who earned her Juris Doctor from University of Illinois - Chicago John Marshall Law School.  She began as a summer associate at DeWitt during the summer of 2019.  She drafts patent applications and responses to the USPTO office actions for patent and trademark applications.  Heather also conducts legal research for patent, copyright, and trademark litigation. 

Prior to joining DeWitt, Heather gained valuable experience as an Electrical Engineer with a worldwide leader in thermal management where she specified components and designed control panels including component placement and wire routing configurations for commercial-sized heating, ventilation, and air conditioning units.  Additionally, she managed and maintained a wiring diagram software for current and new product development.  Further, she researched and compiled a condensed 46-page customized technical electrical standard for department-wide use and researched components for alternative solutions while maintaining product quality​.

While working as a Powertrain Electronics and Controls Engineering Intern with an internationally recognized truck and diesel engine manufacturer, Heather developed and validated controls software for diesel engine emissions aftertreatment system to meet government EPA emissions standards, a tri-state input signal processing system for various circuit configurations, exhaust gas temperature monitor to protect diesel engine from overheating, and created a system design proposal and validation requirements for diesel engine intake air heater controls.

Additionally, Heather is also an avid runner and animal lover.


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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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