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“Some professors are justly renowned for their bravura performances as Grand Expositor on the podium, Agent Provocateur in the preceptorial, or Kindly Old Mentor in the corridors. These familiar roles in the standard faculty repertoire, however, should not be mistaken for teaching, except as they are validated by the transformation of the minds and persons of the intended audience.” “Good teachers evaluate themselves with a pitiless gaze and measure their successes not by their virtuosity as performers but by their contribution to the transformation of students.” ( Bressler, 1991 )
Howard Wainer (Mon,) studied this question.