Tennessee Code Title 49. Education § 49-2-304

(a) Directors of schools may employ one (1) or more supervisors for the supervision of teaching in grades one through twelve (1-12), or any combination of these grades, in the respective school systems.

(b) Any person employed as supervisor for the supervision of teaching shall have a license of qualification issued by the state board of education. The state board of education, in its discretion, may waive the requirement as to supervisors who were employed and serving in that capacity in nonequalizing local school districts as of January 1, 1957.