Professore di capelli grigi che tiene un pezzo di gesso e guarda la lavagna - Foto e immagini stock

Senior lecturer holding book and looking away

Side view of grey hair professor drawing with piece of chalk at blackboard

Senior lecturer holding book and showing one finger up

Senior lecturer writing something on blackboard and showing one finger up

Smiling grey hair professor holding paper plane in lecture hall

Grey hair professor talking by smartphone and looking at camera

Excited professor or scientist in a elegant suit

High angle view of elderly gray-headed man, professor, teacher at lecture, lesson at classroom, indoors. Concept of professional occupation, job, education and motivation. Back to school, university

Senior man in tweed suit writing letter in front of white brick wall

Cheerful businessman in glasses voting near brick wall

Focused senior writer reading manuscript with magnifying glass

Serious senior man writing in notebook with pencil

Senor healing guru with digital tablet showing selenite stone at digital camera

Thoughtful senior writer holding stack of books

Handsome senior writer reading manuscript with magnifying glass

Senior writer looking at photo in frame at his workplace

Pensive mature teacher in glasses holding book and paper cup while looking at window

Portrait of handsome mature businessman in suit and eyeglasses looking at camera in office