Professor mit ernstem Gesichtsausdruck steht mit Papier am Schreibtisch. Mann mit Bart auf weißem Backsteinhintergrund. Lehrer und Schulmaterial im Klassenzimmer. Klassisches Bildungs- und Wissenskonzept - Stockfoto & -bild

Portrait of serious teacher in school classroom. Tutor, professor, mentor man at desk. Studying, learning, training concept

Portrait of serious teacher in school classroom. Tutor, professor, mentor man at desk. Studying, learning, training concept

Teacher and school supplies in classroom. Alternative education and knowledge concept. Man with beard on white brick wall background. Professor with serious face sits at desk.

Portrait of male teacher working at desk in class. Tutor, professor, mentor man at desk. Studying, learning, training concept

Teacher working at desk. Portrait of thinking male teacher, professor, tutor, mentor in school classroom

Portrait of male teacher from preschool or elementary school working at desk in class. Mature man sitting relaxing in a classroom looking at the camera

Tutor and school supplies in classroom. Studying and self development concept. Professor with beard and glasses on white brick wall background. Man with surprised face expression holds scroll

Professional academy. Businessman hold school blackboard. Business education. Study business. Education and study. Education course. Online education. Learn anytime anywhere, copy space.