Sonriente profesor de pelo gris de pie con los brazos cruzados - Foto e imagen de stock

Grey hair professor pointing on something at blackboard

Smiling grey hair professor holding paper plane in lecture room

Grey hair professor pointing on something at lecture hall

Grey hair professor talking by smartphone and looking away

Elderly teacher. Funny professor or scientist in a elegant suit. Copy space on chalkboard, blackboard, banner

Smiling grey hair professor holding piece of chalk

Grey hair professor pointing on something at blackboard with wooden pointer

Confident teacher or professor. People scientist occupation concept. Copy space on chalkboard, blackboard, banner

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

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

Cheerful mature teacher in glasses holding books and looking at camera

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

High angle view of handsome grey hair man reading business newspaper on sofa at home

Portrait of smiling grey hair man looking at camera at home

High angle view of bearded mature businessman in eyeglasses looking at camera in office

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

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

Selective focus of middle aged operator in headset talking and gesturing while working from home

Cheerful senior man pointing with finger and holding glasses

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