Senior barbudo hombre de negocios en gafas con documentos y sonriendo a la cámara aislado en negro - Foto e imagen de stock

Senior bearded businessman in formalwear and eyeglasses holding documents isolated on black

Senior bearded businessman adjusting eyeglasses and looking away isolated on black

Closeup portrait of senior academic professor on lecture near empty blackboard. Knowledge and traditional education concept

Confident middle-aged male teacher or professor standing in front of a blank chalk board. Funny professor or scientist in a elegant black suit. Teachers day

Old bearded man holding his hand in pocket while presenting something on a grey wall.

Old bearded man holding his hand in pocket while presenting something on a grey wall.

Half-length shot of businessman wiping tears away and looking down

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