Mark T. Slate at a glance
- Current role
- Judge
- Jurisdiction
- Wisconsin · State
- Judicial service
- Active
Mark T. Slate
Judge · Green Lake County Circuit Court
Biography
Professional career
- Judge Mark T. Slate is a Circuit Court Judge for Green Lake County, Wisconsin, elected to the bench in 2011 and re-elected in 2017 without opposition, with his current term extending until April 4, 2029
- Judge Mark T. Slate combines a background in law enforcement, private legal practice, and prosecutorial work with over a decade of judicial experience
- After law school, he practiced law in Markesan alongside his father, Bill Slate, and also served as a prosecutor for the Winnebago County and Columbia County District Attorney’s Offices.
Education
- Bachelor’s degree in political science from the University of Wisconsin-Oshkosh and later obtained a J.D. from the University of Wisconsin Law School.
Additional information
- Since then, he has presided over numerous civil and criminal cases in the county, including recent civil filings in 2023.
- Slate ran for the Green Lake County Circuit Court in 2011, winning the primary with 34% of the vote and defeating Jon R. Wilsnack in the general election with 53%.
- The Green Lake County Circuit Court is a trial court of general jurisdiction
- handling both civil and criminal matters, reviewing state agency decisions, and hearing appeals from municipal courts.
- Jury trials are conducted exclusively in circuit courts.
- His career reflects a strong connection to Green Lake County and a commitment to public service, both on and off the bench.
- Judge Slate has been active in the Green Lake County Bar Association, the Republican Party of Green Lake County, the Markesan Chamber of Commerce, and other local organizations.
- Before entering law, he held the role of a police officer in the City of Janesville, gaining practical experience in law enforcement.
- His judicial responsibilities include overseeing trials, ruling on motions, and ensuring fair application of Wisconsin law.
- Born and raised in Markesan, Wisconsin, he graduated from Markesan High School and remains engaged in his community.
- He and his wife, Anja, attend Grace Lutheran Church and have three children and a golden retriever named Justice.
- Outside the courtroom, Slate enjoys board games, fishing, snowmobiling, hunting, and reading.
Applicable Court Rules & Procedures
Camera Notice
Statewide
Wisconsin SCR 61 asks media to give the trial judge advance notice before bringing cameras or recording equipment into the courtroom.
the trial judge shall be given notice, at least 3 days in advanceWisconsin SCR Chapter 61: Electronic Media and Still Photography Coverage of Judicial Proceedings ↗
Courtroom Equipment Control
Statewide
Wisconsin SCR 61 leaves courtroom equipment placement, lighting, and use subject to trial-judge control.
Only equipment approved by the trial judge in advance of the court proceeding may be usedWisconsin SCR Chapter 61: Electronic Media and Still Photography Coverage of Judicial Proceedings ↗
Remote appearances
Statewide
Wisconsin's court system instructs parties that courts will notify them when a hearing is remote and provide joining instructions.
The court will send you instructions on how to join your remote hearing by video or by phone.Wisconsin Court System: Zoom hearing resources ↗
Statewide
Wisconsin remote-hearing guidance tells participants to contact the clerk promptly if they lack reliable internet or phone access.
Contact the clerk of circuit court as soon as possible.Wisconsin Court System: Zoom hearing resources ↗
Published courtroom rules
Shared court rules
Wisconsin SCR Chapter 61: Electronic Media and Still Photography Coverage of Judicial Proceedings
Green Lake County Circuit Court
Scope is limited to the court class in the source claim. Shared court context only; case-type restrictions, exceptions, later amendments and case orders apply. This is not a personal preference or a complete rules inventory.
Official source ↗ · Collected 2026-07-26Sources
Identity source checked August 22, 2026.
Biography sources checked October 11, 2026.
Wisconsin Court System official judicial roster
Identity source · HTML · Source checked August 22, 2026
View Wisconsin Court System official judicial roster ↗Wisconsin SCR Chapter 61: Electronic Media and Still Photography Coverage of Judicial Proceedings
Statewide source · HTML · Source checked July 26, 2026
View Wisconsin SCR Chapter 61: Electronic Media and Still Photography Coverage of Judicial Proceedings ↗Wisconsin Court System: Zoom hearing resources
Statewide source · HTML · Source checked July 26, 2026
View Wisconsin Court System: Zoom hearing resources ↗