A number of former O’Neil Cannon attorneys have devoted a substantial portion of their professional careers to public service after leaving the firm. Those attorneys include the following:
Honorable Thomas Barrett. The Honorable Thomas Barrett served in the Wisconsin State Assembly from 1984 to 1989, the Wisconsin Senate from 1989 to 1993, and the U.S. House of Representatives from 1993 to 2003. In 2004, Barrett became mayor of the City of Milwaukee and remained in that position until 2021, following which he was appointed by the President of the United States to serve as the U.S. Ambassador to Luxembourg from 2022 to 2025. Barrett joined O’Neil Cannon after clerking for a federal judge following graduation from law school and practiced on the Litigation Team.
Justice Annette Ziegler. Justice Annette Ziegler served as a judge of the Washington County Circuit Court from 1997 to 2007 and has served as a justice of the Wisconsin Supreme Court from 2007 to the present. She served as the Chief Justice of the Wisconsin Supreme Court from 2021 to 2025. Justice Ziegler joined O’Neil Cannon following graduation from law school and practiced on the Litigation Team.
Honorable David Borowski. The Honorable David Borowski has served as a judge of the Milwaukee County Circuit Court since 2003. Judge Borowski joined O’Neil Cannon following graduation from law school and practiced on the Litigation Team.
Honorable Laura Lavey. The Honorable Laura Lavey has served as a judge of the Fond du Lac County Circuit Court since 2022. Judge Lavey joined O’Neil Cannon following graduation from law school and practiced on the Litigation Team.
O’Neil Cannon congratulates these four esteemed former colleagues and thanks them for all of their years of public service. O’Neil Cannon is proud to call them alumni of the firm.
