Mich. Comp. Laws § 247.805

Sec. 5. (1) The governor shall appoint the director with the advice and consent of the senate. (2) The director shall possess proven executive and administrative abilities, preferably in the field of public or private transportation or public administration. (3) If the director is not a licensed professional engineer, the director shall designate a deputy director of the department who shall be a licensed professional engineer who shall be responsible to the director for the engineering content of policies and programs. (4) The director shall serve at the pleasure of the governor.