The Probate Pro is no stranger to the Oakland County Probate Court. While we are familiar with the Court, we want to also let others know about it as well. We’ve put together some vital information on Oakland County’s Probate Court including the judges, Court hours and more.


Fun Facts about Oakland County

Founded in 1819, Oakland County is home to 1,202,362 people according to the 2010 census. Oakland County has more people than each of these states: Alaska, Delaware, Montana, North Dakota, Rhode Island, South Dakota, Vermont and Wyoming and the District of Columbia. Oakland County is also the hometown of actor David Spade.


1200 N Telegraph Rd, Dept 457
Pontiac, MI 48341


Parking at the Probate Court is the same as the parking for the Circuit Court. Parking is generally widely available and there are two entrances on the North and South side. However, there are days which the court can get busy, so it is important to leave yourself ample time.

Oakland County Probate Court Judges

Hon. Jennifer S. Callaghan

  • Judge Callaghan was elected to the Oakland County Probate Court in November of 2016. Judge Callaghan graduated undergrad from James Madison College at Michigan State University. She also earned a J.D. from Wayne State University Law School. Judge Callaghan worked as an attorney at Callaghan, PLC with a primary emphasis in Probate law from 2004-2010.

Hon. Linda S. Hallmark

  • Judge Hallmark was the Chief Probate Judge between 2000-2004, 2011-2013 and 2016-2017. Judge Hallmark graduated with a Bachelor of Science from Michigan State University and a J.D. from Wayne State University Law School. Judge Hallmark has been an instructor for Michigan Judicial Institute New Judges School since 2000.

Hon. Daniel A. O’Brien

  • Judge O’Brien was elected to Oakland County Probate Court in November of 2008. Judge O’Brien received his J.D. from University of Detroit School of Law in 1988. Judge O’Brien studied Electric Engineering at Michigan Technological University and graduated in 1981. Judge O’Brien is a member of Michigan Bar Association, Oakland County Bar Association, Michigan Probate Judges Association and Southeast Michigan Probate Judges Association.

Hon. Kathleen A. Ryan

  • Judge Ryan was elected to the Oakland County Probate Court November 2, 2010. Judge Ryan earned her J.D. from University of Detroit Mercy School of Law and attended undergrad at the University of Notre Dame. Judge Ryan has admissions in the State Bar of Michigan; United States Supreme Court; United States District Court – Eastern Division; and United States District Court – Western Division.

Oakland County Hours and Operations

Monday – Friday, 8am – 4:30pm

Oakland County Probate Court Website

The Court has a great, interactive website that allows you to do many things from the comfort of your home. For example, rather than driving all the way to the court to look up information about your case, the court publishes information about all cases that can be found in the Case Search feature on the website.

The Court website also provides a court explorer feature, an inventory fee calculator and many other great resources. The website is

Security Requirements

By court order, weapons and cutting instruments are NOT permitted. There will be airport type security at the Court, therefore it is good to double check your pockets and bags before you enter the court.

Venue and Jurisdiction

The Oakland County Probate Court has jurisdiction over deceased probate estates, trusts, guardianships, and conservatorships. Oakland County Probate Court is the correct venue for people who are domiciled in Oakland County.

Probate Lawyer Near me for the Oakland County Probate Court

The Probate Pro is grateful to be able to practice law in Oakland County. We are here to help you navigate this journey by focusing on your goals.  If you have any questions concerning any aspect of the law, call The Probate Pro at (833) PROBATE.