You don't need a licence (or PhD) to use your brain.
David L
DL
Anderson
D001921:Brain / Q000502:physiology; D003071:Cognition; D004500:Education, Graduate / Q000592:standards*; D008004:Licensure / Q000592:standards*; D011361:Professional Competence; D011641:Public Relations; D012108:Research Personnel / Q000523:psychology / Q000592:standards*