Mich. Comp. Laws § 600.235: Appointment of chief judge for each county; appointment of chief judge of circuit, probate, and district court; procedures for assignment of cases and judges.

Sec. 235.

The supreme court shall appoint a chief judge for each county that is not part of a multicounty judicial circuit. The chief judge of a county shall then appoint a chief judge of the circuit court in that county, a chief judge of the probate court in that county, and a chief judge of the district court in each district in that county.

The chief judge of the county shall adopt procedures for the assignment of cases and for the reassignment of cases, and procedures for the assignment of judges between courts, trial divisions, and districts in that county, subject to section 225(3).