Connecting Clients to Creative Legal Solutions. Since 1903 DeWitt LLP law firm has been guiding clients through a multitude of legal matters. The firm is known for its work in several areas, including intellectual property, patents, trademarks and copyright law, construction litigation, corporate law, employment, environmental, employee benefits, estate planning, family business, family law, government relations, health care, litigation, real estate, and tax law. DeWitt 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, and Green Bay Wisconsin, and Minneapolis, Minnesota, in a variety of legal areas and has the experience to service clients of all scopes and sizes.