Jack F. Speer
Pseudonym of Jack Speer
It isn't sure if this is the same person as John Bristol Speer. What stands the middle initial <i>F.</i> for? Author is located in Washington, D.C., USA, as of 1939. In US Census 1940 of Washington, D.C., no Jack F. Speer, but John B. Speer is included <a href="https://www.familysearch.org/ark:/61903/1:1:K7SX-YLY">here</a>