Dino Antonopoulos

Dino Antonopoulos is a Wisconsin business law and real estate lawyer and shareholder at O’Neil Cannon. He brings more than 20 years of experience to transactional and litigation matters. He began his career representing closely held companies and financial institutions in complex commercial disputes. His early courtroom work included high-stakes jury trials involving seven-figure claims. He now applies that litigation perspective when helping clients prevent conflicts, structure transactions, and protect long-term business interests.

Dino earned a B.A. from the University of Wisconsin—Milwaukee and a J.D. from Marquette University Law School. He belongs to the State Bar of Wisconsin and the Waukesha County Bar Association. His professional affiliations include the Metropolitan Milwaukee Association of Commerce, NARI Milwaukee, and the Independent Business Association of Wisconsin. His legal and business involvement strengthens his understanding of the practical concerns facing owners, lenders, developers, and growing companies.

Dino covers mergers and acquisitions, entity selection, company formation, shareholder agreements, operating agreements, contract negotiations, and owner exit strategies in his business practice. He advises shareholders, members, and partners during ownership transitions and disputes. He serves as outside general counsel to closely held businesses across manufacturing, distribution, retail, development, construction, brokerage, and service industries. His guidance helps clients evaluate legal exposure, negotiate workable terms, and make informed commercial decisions.

Dino Antonopoulos assists clients with commercial real estate acquisitions, development, sales, leasing, and financing. He handles residential and condominium developments, easements, covenants, restrictions, and title-related concerns. He represents lenders and borrowers in complex commercial loan transactions. He founded Antonopoulos Legal Group LLC and led the practice from 2013 through 2024 before joining O’Neil Cannon. His recognition includes selection to Wisconsin Super Lawyers. He supports the community through Tri My Best and youth sports coaching. His communication, preparation, and practical judgment help clients pursue favorable outcomes in important business and property matters confidently.

Law Office Affiliations

• Partner, O’Neil, Cannon, Hollman, DeJong & Laing S.C.
• Member, State Bar of Wisconsin
• Member, Waukesha County Bar Association
• Member, Metropolitan Milwaukee Association of Commerce
• Member, National Association of the Remodeling Industry
• Member, Independent Business Association of Wisconsin

Licensed State

• Wisconsin

Education

• Marquette University Law School
  Juris Doctor (JD)
• University of Wisconsin
  Bachelor of Arts (BA)