cropped image of professor drawing with piece of chalk at blackboard
smiling senior lecturer standing in classroom and looking at camera
grey hair professor covering face with book
Chairs in large assembly hall
pensive grey hair professor standing at blackboard with piece of chalk
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
senior lecturer looking at crumpled pieces of paper on table
grey hair professor holding piece of chalk and looking at blackboard
senior lecturer holding book and looking away
Conference hall. Convention center with podium. Professional meeting. Summit
Help, Im in the wrong class
rear view of senior lecturer writing something on blackboard with piece of chalk
senior lecturer standing between falling crumpled pieces of paper
thoughtful senior lecturer sitting at table with pencil and notebook
grey hair professor pointing on something with pencil on blackboard
side view of grey hair professor drawing with piece of chalk at blackboard
happy senior lecturer holding paper plane in hand
pensive grey hair professor standing at blackboard with piece of chalk
Focused student taking notes during class at the university
senior lecturer leaning on wooden tribune in classroom
grey hair professor showing fist to students
grey hair professor working with laptop
senior lecturer biting eyeglasses isolated on white
grey hair professor leaning on table and walking stick
senior lecturer pointing on something in lecture room
back view of senior lecturer writing something on blackboard with piece of chalk
grey hair professor sitting on table in lecture room and holding book
grey hair professor looking at smartphone in lecture room
