Jonathan W. Groessl

Jonathan W. Groessl is a Rock County lawyer with Dillon Grube, LLC who concentrates on corporate, real estate, construction, and business law. He joined the firm in 2021 after more than 30 years with established local law firms. His background combines private practice with business-side experience, allowing him to approach transactions and legal issues with an understanding of finance, operations, ownership, and commercial decision making.

Groessl earned a B.A. from the University of Wisconsin-Madison in 1982 and an M.B.A. from the same university in 1983. He later graduated from DePaul University College of Law in 1988. Before law school, he worked in finance in Milwaukee. His combined business and legal education provides a strong foundation for advising on corporate structures, real estate matters, construction issues, and commercial transactions.

Before relocating to Janesville, Groessl worked in the business combinations area for an international accounting firm and in mergers and acquisitions for a private equity firm. He later served as Assistant General Counsel for a major heavy equipment and truck trailer manufacturing company. These roles gave him direct experience with transactions, internal business needs, and legal issues affecting companies across different stages of growth.

Jonathan W. Groessl is a member of the State Bar of Wisconsin and brings a long record of business-focused legal work to clients. His experience across law firms, finance, accounting, private equity, and in-house counsel roles supports practical advice on transactions and disputes. He helps businesses and property owners evaluate legal risk, structure agreements, and address operational concerns with commercially informed judgment.

Law Office Affiliations

• Attorney, Dillon Grube Law, LLC.
• Member, State Bar of Wisconsin

Licensed State

• Wisconsin

Education

• University of Wisconsin-Madison
  Master of Business Administration (MBA)
• University of Wisconsin-Madison
  Bachelor of Arts (BA)

Awards & Badges