From a dictionary: per·so·na, pərˈsōnə/ noun
persona; plural noun: personae; plural noun: personas
the aspect of someone's character that is presented to or perceived by others.
"her public persona": synonyms: image, face, public face, character, personality, identify, self
From the writings of university teachers:
“…in addition to having a theory and a subject, all professors develop a persona, a public teaching self which may be either an exaggeration or an evasion of our private self.” (Elaine Showalter, p. 38).