A popular pulp era writer who served on the original Weird Tales editorial staff and appeared frequently in the magazine's early issues, Kline is perhaps best known for his novelistic feud with Edgar Rice Burroughs. He wrote "Planet of Peril" (1929) and two other novels set on the planet Venus and written in the storytelling form of the John Carter of Mars novels, prompting Burroughs to write his own stories set on Venus. In return, Kline wrote two novels set on Mars, as well as several jungle adventurers quite reminiscent of Burroughs's Tarzan.