Mich. Comp. Laws § 121.7
The board of commissioners shall hold their first meeting within 1 month after their selection, on the call of the mayor of the most populous city of the authority, or if no city is a part of the authority, the mayor or president of the most populous village, or if no city or village is a part of the authority, the supervisor of the most populous township, as determined by the last federal decennial census. At the first meeting the board of commissioners shall elect a chairman and a vice-chairman, who shall be members of the board of commissioners, and a secretary and a treasurer, who need not be members. The board shall select and employ such other officers and employees and engage such engineering, legal and other professional services as it deems necessary to effectuate its purposes and fix the compensation therefor. The board may adopt such rules of procedure and bylaws as it deems advisable and shall designate an office or location as its principal place of business.
MCL 121.7