Hoofddocent beschermen zichzelf van dalende verfrommeld stukjes papier - Stockfoto’s en -afbeeldingen

Smiling grey hair professor holding piece of chalk

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

Senior lecturer holding piece of chalk and looking away

Grey hair professor pointing on something at lecture hall

Elderly man combing hair in studio. High quality photo

Grey hair professor pointing on something at blackboard

Grey hair professor pointing on something at blackboard

Elderly man in shirt and jacket using smartphone isolated on grey

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

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

Senior man smiling at camera while holding headphones isolated on grey

Collage of senior man smiling while talking on smartphone on grey background

Smiling senior man holding digital tablet with blank screen isolated on grey

Grey haired man in shirt and jacket smiling at camera while holding laptop isolated on grey

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

Positive elderly man in jacket and bow tie holding bottle of champagne isolated on grey