Lächeln graue Haare Professor mit hölzernem Zeiger - Stockfoto & -bild

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at lecture hall

Senior lecturer pointing on something in lecture room

Senior lecturer leaning on table and looking away

Senior lecturer holding piece of chalk and looking away

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

Thoughtful senior lecturer sitting at table with pencil and notebook

Happy senior lecturer buttoning shirt

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

Senior man smiling at camera while showing thumb up gesture and holding blue jacket isolated on grey

Smiling senior man holding medical mask isolated on grey

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

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

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

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

Excited senior man in bow tie and jacket holding smartphone isolated on grey