From the video page:
Hal Lasko, better known as Grandpa, worked as a graphic artist back when everything was done by hand. His family introduced him to the computer and Microsoft Paint long after he retired.
Now, Grandpa spends ten hours a day moving pixels around his computer paintings. His work is a blend of pointillism and 8-Bit art.
Meet 97-year-old Hal Lasko, The Pixel Painter.