Jack Williamson was referred to as "The Dean of Science Fiction." His first published story was "The Metal Man," in AMAZING STORIES, December, 1928. I've scanned the story from that issue. The illustration is by Frank R. Paul. Even at the age of 20 Williamson's writing had a professional polish, and a narrative drive that propelled the story.
Williamson was an amazing story himself; self-educated in his early years, he went on to get a doctorate and to be a college professor. He died in 2006 at age 98.