Wrote "Wild Bill Hickok, Prince of the Pistoleers".
Published yearly updates to his book "Wilstach's Dictionary of Similes".
His father, John Augustine Wilstach (1824-1897), had received critical acclaim for his translations of works by the Roman author Virgil and Dante's "Divine Comedy".
Brother Claxton Wilstach (c. 1861-1915) was a traveling theater manager and press agent. He died in Boston while preparing to promote the movie The Birth of a Nation (1915).