Graue Haare Professor spricht per Smartphone und schaut weg - Stockfoto & -bild

Smiling grey hair professor holding paper plane in lecture hall

Grey hair professor showing fist to students

Senior lecturer showing idea gesture

Senior lecturer holding book and looking away

Grey hair professor talking by smartphone and looking at camera

Thoughtful senior lecturer sitting at table with pencil and notebook

Grey hair professor using laptop at table in lecture hall

Grey hair professor standing near stack of books

Cheerful businessman in glasses voting near brick wall

Focused senior writer reading manuscript with magnifying glass

Bearded senior writer reading manuscript with magnifying glass

Pensive handsome grey hair man holding book and looking at camera

Senior man in tweed suit reading notes in notebook with magnifying glass

Serious senior man writing in notebook with pencil

Senior man with sheet of kraft paper looking away at workplace

Pensive handsome grey hair man thinking and looking at chessboard at home

Thoughtful senior man with pencil and sheet of paper in front of white brick wall