This is John Steel. The name is penciled in handwritten script on the reverse.
The photo was taken at Boy’s Photo Studio, 537 Main Street, Bristol, Tenn.
A little archive searching turned up another Boy’s Photo Studio portrait securely dated to 1910, so I feel certain that this dates to the early quarter of the 20th century. The Steel family came to the Bristol area in the late 18th century. This man is probably a non-professional worker, judging by the shirt, but he looks alert and healthy, though his face is pretty lined. I’m terrible at guessing age, but I think he’s in his mid- to late-40s.