Murray Leinster
Jenkins, William Fitzgerald
June 16, 1896 – June 8, 1975
Norfolk, Virginia, USA
314 works, first published 1918
According to <a href="https://www.sf-encyclopedia.com/entry/leinster_murray">SFE</a>: "The similarities in background from one late novel to another were sufficiently numerous for these books to make up one loose series – but through sameness, not through any articulated central conceit."