David W. Maas

Professional career

• The elected Circuit Court Judge for Branch 4 of Waukesha County, Wisconsin, sworn in on August 14, 2025, after winning the April 1, 2025 election.
• Assistant District Attorney, Fond du Lac County (2023–2025)
• Assistant Attorney General, Wisconsin Department of Justice
• Assistant District Attorney, Milwaukee County
• Judge Maas has stated that his desire to be a judge stems from his extensive prosecutorial experience and a deep commitment to justice and the rule of law

Education

Additional information

• April 1, 2031
• Elected in the April 1, 2025 Wisconsin General Election and will serve until
• First appointed/elected in 2025 and took the oath of office on August 14, 2025, before Presiding Judge Ralph M. Ramirez, in the William G. Callow ceremonial courtroom, attended by friends, family, and members of the bench and bar.
• He defeated incumbent Bridget Schoenborn in the April 1, 2025 general election for Branch 4.
• (2023–2025): Prosecuted a variety of criminal cases, managed motions, settlements, and trials; oversaw electronic communication warrants and subpoenas; trained prosecutors and law enforcement on legal process and privacy law
• (2008–2023): Led the Criminal Litigation Unit, prosecuted statewide cases among them cybercrime and child exploitation, reviewed warrants and wiretap requests, and trained prosecutors and law enforcement
• , University of Wisconsin Law School (1998)
• , Rice University (1995)
• Prosecutorial experience included issuing charges, litigating motions, negotiating settlements, and trying cases
• Courtroom: 2‐1300, Waukesha County Courthouse, 515 W. Moreland Blvd, Waukesha, WI 53188
• Judge Maas presides over
• J.D.
• B.A. in Economics
• His appointment followed a long career in Wisconsin’s prosecutorial system, and he is known for his commitment to fairness, due process, and efficient courtroom management
• He emphasizes punctuality, preparation, impartiality, respect, and ethics in judicial conduct, and believes a judge should be comfortable managing large caseloads and high-pressure environments
• Beyond his judicial role, Maas has been active in legal education, delivering statewide, national, and international presentations on trial techniques, digital evidence, ethics, and privacy law
• David W. Maas
• , which handles a wide range of criminal and civil cases