Stock Photos: smart slim man

Old professor touching his beard and reading a book attentively
Feeling quite serious when thinking about science
Roosevelt wore a bowtie too
Old professor holding book and looks surprised
Serious looking mature professor standing with hands folded
Mature man pointing up and looks like explaining something
Mature man adjusting his eyglasses and looking lost
Mature professor seems to don't understand something
Smiling old professor holding small blackboard and pointing on it
Who's ready to start study time?
I have some problems with understanding that
Old professor standing at the table and holding digital tablet
Well, and what we're gonna do about that?
Laughing mature professor standing with his hands folded and eyeglasses off
Old professor holding tablet with one hand
Trying to teach students some geography
Old professor hugging globus
I like to stay on top of things, you know
Old professor seems like saying something and holding a tablet
mature professor looking lost and mad
I just can't go with what's written here
Mature professor laughing hard about something
Old professor sitting in profile and attentively looking at digital tablet
Old professor sitting in profile and using tablet
Old professor holding a book and pointing on it
Old professor holding fists like bunny ears
Well, and what do you think about this thing?
Getting more familiar with new device
Guessing what next should i read
Ok, and now tell me what's this?
Serious looking old professor standing with his hands folded
Mature professor adjusting his eyeglasses
Laughing mature professor holding his glasses
This science decision is not my thing
Pensive mature man bitting his eyeglasses
Oh, i didn't see it coming
Well, are you ready to start your learning process?
Quite contented with work result
Old professor holding small blackboard
Serious mature professor adjusting glasses and seems like not understanding something
Laughing old professor with his eyeglasses on his head
Information in this book just blows me away
Thinking about all these work things
Old professor holding small blackboard
Would you take a closer look on this spot?
Old professor hugging globus
Figuring out some physical things
Excited mature professor adjusting eyeglasses
This digital device is quite a thing
Mature professor looking confused
Well, it looks like quite new information for me
Well, and i actually can find anything with help of this?
Could someone explain me a little on this?
Focused on checking morning news
Guess, there's nothing i can do about that
Surprised old professor holding globus and pointing on it
Hm, should i read more books or news already?
Smiling old professor holding a book with hands spread
Old professor involved in reading a book
When science work's been just great