expositor
noun
ex·pos·i·tor ik-ˈspä-zə-tər 
: a person who explains : commentator
Example Sentences
Recent Examples on the Web As a scholar and a jurist, Scalia was the chief expositor of the judicial philosophy known as originalism. 
Jeffrey Toobin, The New Yorker, 9 Dec. 2019
Jeffrey Toobin, The New Yorker, 9 Dec. 2019 Word History
Etymology
Middle English expositour, from Anglo-French expositur, from Late Latin expositor, from Latin exponere
First Known Use
14th century, in the meaning defined above
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