The reading, research, and other preparation that your professor did to get ready for the lecture in your sociology class was done in what Erving Goffman refers to as:

Master Statues

Explanation:

This is a phenomenon in which a person holds a position like a teacher, lecturer, mother, father when trying to show himself or herself to others that they have such position which they hold on that time. Irving Goff man was an American sociologist who gives this concept. These are social concepts that are related to social identity and influence a person's role and position in society. Occupation mostly called a master status which forms an important of a personal identity which affects another role such as mother-father, teacher, professor, etc.