Mich. Comp. Laws § 450.4902

Sec. 902. As used in this article: (a) "Licensed person" means an individual who is licensed or otherwise legally authorized to practice a professional service by a court, department, board, commission, or an agency of this state or another jurisdiction, any corporation or professional services corporation all of whose shareholders are licensed persons, any partnership all of whose partners are licensed persons, or any limited liability company all of whose members and managers are licensed persons. (b) "Professional service" means a type of personal service to the public that requires as a condition precedent to the rendering of the service the obtaining of a license or other legal authorization. Professional service includes, but is not limited to, services rendered by a certified or other public accountant, chiropractor, dentist, optometrist, veterinarian, osteopathic physician, physician, surgeon, podiatrist, chiropodist, physician's assistant, architect, professional engineer, land surveyor, or attorney-at-law. (c) "Professional services corporation" means a corporation formed under former 1962 PA 192 or a corporation incorporated under and governed by chapter 2A of the business corporation act, 1972 PA 284, MCL 450.1101 to 450.2098.