Okla. Stat. tit. 18, § 811

A domestic professional entity may render professional services in this state only through its owners, managers, employees and agents who are duly licensed or otherwise permitted in accordance with the provisions of this state’s licensing laws to render professional services. A foreign professional entity may render professional services in this state only through its owners, managers, employees, and agents who are duly licensed or otherwise permitted in accordance with the provisions of this state’s licensing laws to render professional services in this state. The provisions of this section shall not be interpreted to include in the term “employee”, as used herein, clerks, secretaries, bookkeepers, technicians and other assistants who are not usually and ordinarily considered by custom and practice to be rendering professional services to the public for which a license is required.