Selbstbewusste männliche Lehrer mittleren Alters oder Professoren, die mit verschränkten Armen lächelnd vor einer leeren Kreidetafel stehen - Stockfoto & -bild

Confident middle-aged male teacher standing in front of a blank green chalkboard with folded arms looking at the camera with a friendly smile

Grey hair professor sitting on table in lecture room and holding book

Handsome hipster mature smart educator. After classes. Degree certificate. Paperwork documentary files. School homework. Back to school. Knowledge day. Man work school teacher sit in classroom.

Smiling grey hair professor sitting on table in lecture room

Ensure suitability of dissertation for presentation. Paperwork documentary files. School homework. Back to school. Knowledge day. Black and white. Man school teacher sit in classroom. Handsome mature

Handsome hipster mature smart educator. After classes. Degree certificate. Paperwork documentary files. School homework. Back to school. Knowledge day. Man work school teacher sit in classroom.

Male teacher taking question in class pointing with his pen with look of concentration

Handsome lecturer or teacher with a confident smile standing with folded arms in front of a blank chalkboard in a classroom

Pensive middle-aged man standing against grey background looking up, with copy-space

Close up of smiling middle aged man with receding hairline and mustache sitting on sofa

Thoughtful man seated on sofa at home resting his chin on his hand staring intently ahead watching something in a profile view

Portrait of a confident man looking at camera while sitting at desk in front of a folder with business files during work in the office

Portrait of a man thinking with worried facial expression while analysing documents or business reports during work at desk in the office

Self-conscious middle-aged businessman standing with arms crossed