Smiling grey hair professor holding piece of chalk - Stock Photo & Image

Senior lecturer holding piece of chalk and looking away

Grey hair professor pointing on something at lecture hall

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

Side view of grey hair professor correcting something at blackboard

Happy senior lecturer buttoning shirt

Senior lecturer pointing on something in lecture room

Grey hair professor pointing on something at blackboard

Senior lecturer holding book and looking away

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

Positive senior man in blue jacket and bow tie touching eyeglasses isolated on grey

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

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

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

Serious senior man in tweed suit and glasses looking at camera

Portrait of smiling grey hair man looking at camera at home

Excited senior man in bow tie pointing with fingers at camera isolated on grey

Excited senior man in headphones waving hand at smartphone on chair on grey background