(1888 - 1924)
Other SF books by Flint were The Devolutionist and the Emancipatrix (Ace, 1965) and The Lord of Death and the Queen of Life (Ace, 1965). The stories in both books were originally written for pulp magazines nearly 50 years before they saw book publication.
Flint died mysteriously, his body found at the bottom of a canyon.
For more on him, see http://www.sf-encyclopedia.com/entry/flint_homer_eon