Mich. Comp. Laws § 124.535

Sec. 5. A joint board or commission may be established by the political subdivisions involved to supervise the execution of a contract. An officer or employee of the state or a political subdivision or agency thereof, except a member of the legislature, may serve on or with any joint board or commission created by the contract and shall not be required to relinquish his office or employment by reason of such service.