Other than the fact that he was born in Missouri and his first credited cover work was for Amazing Stories in 1942, I haven’t been able to find out much about James B. Settles. As an illustrator, Settles had a good eye for detail and an obvious affinity for mechanical drawings. Though he did his share of front covers, Settles is probably best-known for illustrating the back covers of Amazing Stories. His back cover illustrations almost always seemed to be of some sort of futuristic mode of transportation.
Here’s a sampling of the work of the mysterious James B. Settles: