Maryland Code, Corporations and Associations § 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.