Pensoso conferenziere anziano in piedi con matita isolata su bianco - Foto e immagini stock

Happy senior lecturer standing at wooden tribune isolated on white

Cropped image of senior lecturer holding book and showing one finger up

Smiling senior lecturer holding clipboard and looking at camera

Senior lecturer leaning on table and looking away

Smiling grey hair professor holding stack of books with apple on top

Senior lecturer holding piece of chalk and looking away

Senior lecturer using tablet isolated on white

Education goals. School education concept. Useful knowledge. Education trends. Adaptive learning systems use data adjust learning individual scale. Senior intelligent man teacher at chalkboard.

Elderly man in bow tie and blue jacket using smartphone isolated on grey

Portrait of smiling grey hair man looking at camera at home

Pensive handsome grey hair man holding book and looking at camera

Confused senior man showing dubium gesture while looking at camera isolated on grey

Smiling senior man in shirt and jacket pulling hand at camera on blurred foreground isolated on grey

Elderly man in shirt and jacket using smartphone isolated on grey

Cropped shot of senior man with pencil and sheet of paper

Positive senior man talking on smartphone and pointing with finger isolated on grey