Not just any old man -- this is the great American illustrator Norman Rockwell (1894-1978), and this is known, for obvious reasons, as 'Triple Self Portrait'. All Rockwell's liveliness and wit are here, and I love the way he's got some famous examples pinned up on his board.
I've always loved Rockwell and have posted him before on here, so when I was contacted by someone asking me to post a link to a new site promoting his work, I thought I'd do it. It's called Artsy, and here's the link. Looks like it's a work in progress, but it's got some biographical info, and so far just one painting -- this famous one, called 'New Kids in the Neighbourhood':
Any Rockwell lovers out there?