Senior professor pointing at formulas on chalkboard and explaining them to group of college students while giving lecture
Senior professor in glasses and formal suit pointing at blackboard and writing with chalk while giving lecture in college
Portrait of Young Female Teacher in Classroom Giving a Lecture Class Using a Blackboard with Mathematic Formulas to Explain. College Science Professor Teaching, Talking to her Students
Portrait of Young Female Teacher in Classroom Giving a Lecture Class Using a Blackboard with Mathematic Formulas to Explain. College Science Professor Teaching, Talking to her Students
Portrait of Young Female Teacher in Classroom Giving a Lecture Class Using a Blackboard with Mathematic Formulas to Explain. College Science Professor Teaching, Talking to her Students
African American professor pointing at graphs and formulas on blackboard and speaking to students while giving math lesson in university
Senior professor writing with chalk on blackboard and talking to students while giving lecture in college
Close up view of senior professor using chalk while writing on blackboard and giving lecture in college
Senior Caucasian male professor at military academy in formalwear pointing at tactical vest on one of recruits while giving lecture to students in classroom
Mid-adult professor giving lecture to diverse students with blackboard
Professor teaching physics to students in college
Medium close up of male African American teacher standing in front of blackboard in classroom giving lecture on programming at daytime