Is he a doctor, perhaps?
Notice that in the middle photo it looks as if he is carrying some sort of injection needle or epi-pen.
Compare the pin in the man's lapel in these photos.
It looks like the same man even though he is wearing glasses in the photo on the left
The other guy, people around here have taken to calling him Bart, (I prefer Fat Face myself), is quite chubby.
I have no information about who the first guy is, but he appears to be more legitimate than Bart/Fat Face and I would assume he's Secret Service. But again I have no information about him.