Texas Occupations Code - OCC § 1151.151. Registration Required; Exemption

(1) the chief appraiser of an appraisal district, an appraisal supervisor or assistant, a property tax appraiser, an appraisal engineer, and any other person authorized to render judgment on, recommend, or certify an appraised value to the appraisal review board of an appraisal district;

(2) a person who engages in appraisal of property for ad valorem tax purposes for an appraisal district or a taxing unit;

(3) an assessor-collector other than a county assessor-collector;

(4) a collector or another person designated by a governing body as the chief administrator of the taxing unit's assessment functions, collection functions, or both; and

(5) a person who performs assessment or collection functions for a taxing unit and is required to register by the chief administrator of the unit's tax office.