Graue Haare Professor Blick auf Studenten aufsteigende Hände - Stockfoto & -bild

Happy senior lecturer holding paper plane in hand

Pensive grey hair professor standing at blackboard with piece of chalk

Grey hair professor pointing on something with finger at blackboard

Happy senior lecturer with open arms standing near blackboard

Grey hair professor pointing on something with pencil on blackboard

Grey hair professor pointing on something with wooden pointer

Grey hair professor correcting something at blackboard

Smiling grey hair professor sitting on table with laptop

Cropped image of senior professor pointing on something with pencil on blackboard

Smiling elderly man looking at camera while holding laptop isolated on grey

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

Cropped image of professor drawing with piece of chalk at blackboard

African american teacher writing on notebook near globe in classroom

Serious senior man writing in notebook with pencil

Handsome grey hair man sitting at table with chessboard and looking at camera

African american teacher having idea near laptop, blurred globe and stationery in classroom