Senior Professor ernst. Schullehrer oder College und Universitätsvorlesung. Zurück zur Schule - Stockfoto & -bild

Senior academic professor on lecture near empty blackboard. Knowledge and traditional education concept

Cheerful funny academic professor in the library, knowledge, learning and education concept. Think senior teacher

Teacher in the classroom near the blackboard is teaching a lesson. Professor at the university is giving a lecture.

Elderly Senior professor reading an old book in the library, knowledge, learning and education concept

Elderly Senior professor reading an old book in the library, knowledge, learning and education concept

Excited professor or scientist in a elegant suit

Old male teacher. Senior professor with gray hair in college. Think

Teacher preparing for university exams. Professor holding a book and pointing. Teacher in college on university lecture

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

Happy young businessman entrepreneur using computer looking at screen working in internet sit at office desk

Boring job. Portrait of young man sitting at his desk in the office. Funny worker. Wide angle.

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

Businessman marketer working at the computer in the office, programmer, business analyst, designer, manager

Portrait of thinking male teacher in school classroom. Teacher sitting on desk writing text in book at school classroom

Tutoring. Back to school and happy time. Bearded professor at school lesson at desks in classroom. Teacher preparing for university exams. Friendly teacher in classroom near blackboard desk

Bearded man in casual suit in office. Man with beard and mustache on serious face. Confident businessman at working place. Business and office lifestyle. Confidence and success concept.