Kiel Zillmer

Attorney Matthew Fernholz focuses his practice on commercial litigation, trust and fiduciary disputes, business torts, trade secrets, non-compete agreements, defamation, and appellate work. In addition, he has developed one of the preeminent political and election law practices in the State of Wisconsin, and has handled several high-profile matters, from representing candidates for statewide office, successfully challenging the Governor’s emergency powers, arguing before the Wisconsin E...

Mike Carlton worked as a trial attorney at the U.S. Department of Justice in Washington, D.C., representing the EPA and other government agencies. Thereafter, he worked as a senior attorney and policy analyst with the Environmental Law Institute, and then as Wisconsin counsel for a national environmental organization. Mike has taught and studied environmental law and policy in Washington, D.C., London, and the University of Wisconsin Law School. Mike heads the firm’s Environmental Law P...

Keith E. Kopplin is a lawyer recognized by Best Lawyers in the practice areas of Employment Law - Management and Litigation - Labor and Employment. Keith E. practices law in Milwaukee, Wisconsin Best Lawyers has recognized Keith E. Kopplin since 2021. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Keith E. Kopplin is held by other lawyers.

Philip R. O'Brien is a lawyer recognized by Best Lawyers in the practice area of Employee Benefits (ERISA) Law. Philip R. practices law in Milwaukee, Wisconsin Best Lawyers has recognized Philip R. O'Brien since 2026. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Philip R. O'Brien is held by other lawyers.

James M. Sosnoski is an attorney in Meissner Tierney’s litigation practice group. He represents businesses and insurers in a wide variety of matters, including insurance coverage, environmental litigation business and corporate disputes, and employment disputes and non-competition agreements. James also specializes in handling all aspects of civil appeals. Prior to joining the firm, James served as Term Law Clerk to Justice Rebecca G. Bradley, Supreme Court of Wisconsin, and the Honorab...

Jason is a Shareholder at O’Neil Cannon where he leads the firm’s Corporate Practice Group and serves on the firm’s Board of Directors. With more than 15 years of experience, Jason primarily focuses on mergers and acquisitions. In this role, he represents buyers and sellers, including mature companies, family offices, wealthy individuals who aspire to acquire a business, and private equity groups. In addition to his M&A practice, Jason works closely with his corporate cl...

Bill West is a Shareholder and Chairs the Business Section and Co-Chairs the Mergers & Acquisitions Section. Bill is a trusted advisor to his clients and they rely on his ability to achieve desired outcomes in a practical, timely and cost-effective manner – in other words, he gets things done. He has over 30 years of experience in corporate and business related transactions including: Mergers and acquisitions Complex corporate and commercial transactions Corporate governance and bus...

William H. Tobin is a lawyer recognized by Best Lawyers in the practice area of Employee Benefits (ERISA) Law. William H. practices law in Milwaukee, Wisconsin Best Lawyers has recognized William H. Tobin since 2016. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which William H. Tobin is held by other lawyers.

Lucas J. Pagels is a lawyer recognized by Best Lawyers in the practice area of Employee Benefits (ERISA) Law. Lucas J. practices law in Milwaukee, Wisconsin Best Lawyers has recognized Lucas J. Pagels since 2024. The Best Lawyers recognition is based on a peer-review survey of lawyers in the same geographic region and legal practice area. The recognition reflects the professional regard in which Lucas J. Pagels is held by other lawyers.

Nate Johnson is a Shareholder and Co-Chair of the General Litigation Section. His practice focuses on insurance defense claims, product liability, toxic tort, strategic risk and crisis management. Nate has successfully tried numerous cases to verdict throughout Wisconsin. Nate has significant experience litigating cases in the following areas: Products liability Insurance coverage Business/Commercial disputes Construction Personal injury Wrongful Death Premise liability Professional liability