senior lecturer sleeping at working table
grey hair professor looking at laptop
grey hair professor holding stack of books with apple on top
side view of senior lecturer writing something on blackboard with piece of chalk
senior lecturer holding book and looking away
senior lecturer protecting himself of falling crumpled pieces of paper
cropped image of senior lecturer writing something in notebook
smiling grey hair professor holding piece of chalk
senior lecturer leaning on table and looking away
senior lecturer looking at crumpled pieces of paper on table
smiling grey hair professor holding wooden pointer
grey hair professor looking at book
grey hair professor pointing on something at blackboard
grey hair professor holding piece of chalk and looking at blackboard
Students sitting in the foyer of modern university building
Empty classroom with a single chair and an open book ready for learning
senior lecturer writing something on blackboard and showing one finger up
senior lecturer holding book and looking away
Students sit facing camera in a modern university classroom
happy asian student girl looking at camera during lesson
grey hair professor pointing on something with wooden pointer
senior lecturer leaning on wooden tribune in classroom
grey hair professor holding book and pointing on something at blackboard
grey hair professor correcting something at blackboard
senior lecturer using tablet isolated on white
grey hair professor holding paper plane in lecture hall
bored african american student sitting at desk during lesson
smiling grey hair professor standing with crossed arms
grey hair professor talking by smartphone and looking at laptop
smiling grey hair professor holding paper plane in lecture hall
