Michigan Compiled Laws, Chapter 600. Revised Judicature Act of 1961 § 600.901

Sec. 901. The state bar of Michigan is a public body corporate, the membership of which consists of all persons who are now and hereafter licensed to practice law in this state. The members of the state bar of Michigan are officers of the courts of this state, and have the exclusive right to designate themselves as “attorneys and counselors,” or “attorneys at law,” or “lawyers.” No person is authorized to practice law in this state unless he complies with the requirements of the supreme court with regard thereto.