Teacher at lectern in lecture theatre presenting to students, shot on R3D

indoors one person man african american ethnicity black 40s middle aged large group of people men women young adults adults 20s millennials diversity multi-ethnic group teacher lecturer students disabled student education higher education presenting lecturing teaching talking gesturing listening technology av display big screen green screen communication lecture lesson learning concentrating attention presentation university college lectern lecture theatre lecture room audience pov point of view desk wheelchair waist up lockdown