Mich. Comp. Laws § 38.2203

Sec. 203. (1) Each appointed retirement board member, before assuming office, shall take an oath of office. An appointed retirement board member shall immediately file the oath of office with the secretary of state. A retirement board member is a trustee of the retirement system. (2) A majority of the retirement board constitutes a quorum for the transaction of business at a meeting of the retirement board. An appointed retirement board member who fails to attend 2 consecutive, regularly scheduled meetings of the retirement board and whose absence is not excused by the retirement board is considered to have resigned from retirement board membership. The retirement board shall declare the appointed retirement board member's office vacated as of the date of adoption of a proper resolution. (3) The retirement board shall elect from its membership a chairperson and vice chairperson. The chairperson and vice chairperson of the retirement board shall take office immediately upon election and serve until a successor is elected.