Derrick A. Grubb at a glance
- Current role
- Judge
- Jurisdiction
- Wisconsin · State
- Judicial service
- Active
Derrick A. Grubb
Judge · Rock County Circuit Court
Biography
Professional career
- Judge on the Rock County Circuit Court (Branch 2) in Wisconsin, appointed by former Governor Scott Walker in 2018 to replace retiring Judge R. Alan Bates
- 27 years as a Rock County attorney
Education
- Marquette University Law School — J.D. (1991)
- Western Illinois University — B.A. (1988)
Additional information
- Grubb has been a sole practitioner and president of Grubb Law Firm, S.C. since 1997
- Before his judicial appointment, he also held the role of general manager of Beloit Ford, Lincoln-Mercury, Inc. (2001–2003) and was appointed by the Rock County Board of Judges as Guardian ad Litem for four years.
- handling personal injury, civil litigation, and family law matters.
- Over 1,300 clients represented and hundreds of trials/hearings litigated
- Community involvement through the Greater Beloit Chamber of Commerce and Beloit Snappers
- Grubb presides over criminal, family, and civil cases in Rock County, including recent matters such as divorce, consumer debt, and general criminal cases.
- He has also served on the Wisconsin Supreme Court’s Office of Lawyer Regulation District 12 Committee for nine years, investigating attorney grievances.
- He serves in Branch 2, Floor 3R, Courtroom E of the Rock County Circuit Court.
- He is a member of the Rock County Bar Association and the American Bar Association.
- Born in Berwyn, Illinois, Grubb resides in Beloit, Wisconsin, with his wife Debbie and four adult children.
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
Rock 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 ↗