Sonriente profesor senior de pie en el aula y mirando a la cámara - Foto e imágenes de stock

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at lecture hall

Grey hair professor sitting on table in lecture room and holding book

Senior lecturer holding piece of chalk and looking away

Smiling grey hair professor holding paper plane in lecture room

Senior lecturer leaning on table and looking away

Happy senior lecturer buttoning shirt

Grey hair professor holding stack of books

Senior lecturer pointing on something in lecture room

Smiling senior man looking at camera while touching jacket isolated on grey

Smiling elderly man in eyeglasses and bow tie looking at camera isolated on grey

Senior man in stylish tweed suit looking away in front of white brick wall

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

Full length view of man in suit and eyeglasses sitting on high stool and reading newspaper on dark grey

Serious man in tie touching chin while looking at camera isolated on black

Elderly man in suit and eyeglasses looking at camera while talking on cellphone isolated on dark grey

Happy bearded speaker in glasses talking near microphones and brick wall

Thoughtful senior man in grey jumper and tie holding hand near chin isolated on black

Serious senior man pointing with hand and talking on cellphone while sitting on dark grey

Businessman in stylish formal wear adjusting eyeglasses and looking at camera isolated on dark grey

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

Positive senior man in eyeglasses talking on mobile phone while looking away isolated on black