American editor and author of works of fantastic fiction of some interest.
Originally trained in law, he turned to journalism, first as a correspondent, and later as editor. In 1917, published his first fantasy, The People of the Pit, in Weird Tales. This was followed by many more tales, including: Through the Dragon Glass , The Moon Pool  and its sequel The Conquest of the Moon Pool , The Metal Monster , The Face in the Abyss , The Ship of Ishtar, Dwellers in the Mirage , The Woman of the Wood , Burn, Witch, Burn! , Creep, Shadow, Creep! , The Drone Man  and The Fox Woman .
Merrit also had a passion for exotic plants, writing numerous articles on botany. Also discoverer, with S. Weir Mitchell, of psychedelic drugs.
He died in Florida in 1943, after a heart attack.