Tennessee Code Title 16. Courts § 16-2-509

(a) The judges in each judicial district shall assemble for the purpose of selecting a presiding judge of the district. In August of each year, the judges within each district shall assemble at the call of the presiding judge and select a successor to such presiding judge who shall serve until September 1 of the following year. If upon any selection date the judges in any district fail to choose or are unable to agree upon the selection of a presiding judge, the chief justice of the supreme court shall designate one (1) of their number to serve.

(b) It is the duty of the presiding judge to:

(c) To effectuate the duties enumerated in subsection (b), the presiding judge may assign cases to judges and chancellors within the district over which the judge presides. In assigning cases, the presiding judge shall, whenever possible and not detrimental to the orderly and efficient administration of justice, give due regard to the court upon which the judge or chancellor serves, the judge's or chancellor's particular background, experience and preference and economy of judicial travel time.

(d) If a presiding judge is unable to correct a caseload imbalance or reduce docket delays utilizing the available judges within the district over which the judge presides, it is the affirmative duty of the presiding judge to contact other presiding judges and request assistance or contact the supreme court and request assistance pursuant to § 16-3-502.

(e) This part shall not be construed as altering or modifying any law concerning interchange by agreement.