Are professional engineers licensed by discipline (civil, electrical, mechanical, etc.) in Tennessee?

No. Engineers (as well as architects and landscape architects) are allowed to practice any discipline in which they are competent by reason of education and/or experience. A registrant may have expertise beyond the discipline in which he or she is educated and examined. The Rules of Professional Conduct state that registrants shall perform services only in their areas of competence. Registrants may be disciplined by the Board for practicing outside their areas of competence.