Md. Code, Corps. & Ass'ns § 5-121

(a) (1) An individual who renders a professional service in this State as an employee of a domestic or foreign professional corporation is liable for a negligent or wrongful act or omission in which the individual personally participated to the same extent as if the individual rendered the service as a sole practitioner. (2) An employee of a domestic or foreign professional corporation is not liable for a negligent or wrongful act or omission of another employee of the corporation unless the employee is negligent in appointing, supervising, or cooperating with the other employee. (b) A domestic or foreign professional corporation whose employees perform professional services within the scope of their employment or within the scope of the employees’ apparent authority to act for the corporation is liable to the same extent as its employees. (c) The personal liability of a stockholder of a domestic or foreign professional corporation is no greater in any respect than the liability of a stockholder of a corporation incorporated under the Maryland General Corporation Law.