Born in Beverly, New Jersey, he moved to Philadelphia, Pennsylvania in 1894. Originally trained in law, he turned to journalism, first as a correspondent and later as editor. According to Peter Haining, Merritt survived a harrowing experience while a young reporter at the Philadelphia Inquirer about which he refused to ever speak, but would, as Haining claims, mark a turning point in Merritt's life. He was assistant editor of The American Weekly from 1912 to 1937 under Morrill Goddard, then its editor from 1937 until his death. As editor, he hired the unheralded new artists Virgil Finlay and Hannes Bok and promoted the work done on polio by Sister Elizabeth Kenny.
His fiction, eight complete novels and a number of short stories, was only a sideline to his journalism career. One of the best-paid journalists of his era, Merritt made $25,000 per year by 1919, and at the end of his life was earning $100,000 yearly—exceptional sums for the period. His financial success allowed him to pursue world travel—he invested in real estate in Jamaica and Ecuador—and exotic hobbies, like cultivating orchids and plants linked to witchcraft and magic (monkshood, wolfbane, blue datura, peyote, and cannabis).
He was described as a hypochondriac who talked endlessly about his medical symptoms, and showed eccentric behavior like a need to try out any food, tobacco and medicine he found on his coworkers desks. Occasionally he would dress in a kilt and play serenades for his coworkers with some of his huge collection of instruments he kept in a locked closet at work. He was well liked for his fairness and inability to fire any employees.
Merritt married twice, once in the 1910s to Eleanore Ratcliffe, with whom he raised an adopted daughter, and again in the 1930s to Eleanor H. Johnson. He lived in the Hollis Park Gardens neighborhood of Queens, New York City, where he accumulated collections of weapons, carvings, and primitive masks from his travels, as well as a library of occult literature that reportedly exceeded 5000 volumes. He died suddenly of a heart attack, at his winter home in Indian Rocks Beach, Florida, in 1943.
What sets Merritt apart from the typical pulp author, however, is his lush, florid prose style and his exhaustive, at times exhausting, penchant for adjective-laden detail. Merritt's fondness for micro-description nicely complements the pointillistic style of Bok's illustrations.
The Fox Woman and the Blue Pagoda (1946) combined an unfinished story with a conclusion written by Merritt's friend Hannes Bok. The Fox Woman and Other Stories (1949) collected the same fragment, minus Bok's conclusion, with Merritt's short stories. The book The Black Wheel was published in 1948, after Merritt's death; it was written by Bok using previously unpublished material as well. Both these books were also illustrated by Bok and published by the small press The New Collectors Group in hardcover.
After Merritt's death, Sam Moskowitz discovered a number of poems among his papers. Though some may have been written by other authors, they were credited to Merritt when published.
Merritt was a major influence on H. P. Lovecraft and Richard Shaver, and highly esteemed by his friend and frequent collaborator Hannes Bok, a science fiction illustrator. Karl Edward Wagner included Burn Witch Burn on his list of "The Thirteen Best Supernatural Horror Novels" in the May 1983 issue of The Twilight Zone Magazine.Michael Moorcock and James Cawthorn list The Ship of Ishtar and Dwellers in the Mirage as two of the novels in their book Fantasy: the 100 Best Books, describing the former book as Merritt "at the peak of his powers", and Merritt's work as a whole being full of "memorable images".Robert Bloch also included Burn Witch Burn on his list of favourite horror novelsGary Gygax, creator of the gameDungeons and Dragons, listed Merritt in "Appendix N" of the Dungeon Masters Guide and often noted that he was one of his favorite fantasy authors. In the Lensman series by E.E. Smith, there is a reference to the novel Dwellers in the Mirage in which the protagonist Kimball Kinnison references the book and a quotation from it "Luka—turn your wheel so I need not slay this woman!"
Seven Footprints to Satan was republished in the January 1949 issue of Fantastic Novels.
"The Rhythm of the Spheres" (originally a chapter called "The Last Poet and the Robots" or "The Last Poet & the Wrongness of Space" in the 1934 round robin novel titled Cosmos, revised in 1936 as a stand-alone work) Available online
The August 1926 Weird Tales cover-featured the first publication of "The Woman of the Wood"
"The Whelming of Cherkis" (excerpt from The Metal Monster, 1946)
^All-Story and Munsey's much older magazine The Argosy were merged in August 1920, as Argosy All-Story Weekly. The Frank Munsey Company magazines were reorganized again in October 1929 (four years after Munsey's death), after which Merritt's stories appeared in the weekly Argosy.
^ abPartners in Wonder: Women and the Birth of Science Fiction, 1926–1965 by Eric Leif Davin, Lexington Books, 2005, pages 409–10.
^ abcdA. Merritt at the Internet Speculative Fiction Database (ISFDB). Retrieved 2013-04-23. Select a title to see its linked publication history and general information. Select a particular edition (title) for more data at that level, such as a front cover image or linked contents.
^"I was extremely glad to meet Merritt in person, for I have admired his work for 15 years. ... he has a peculiar power of working up an atmosphere and investing a region with an aura of unholy dread" H.P. Lovecraft's letter to R. H. Barlow (January 13, 1934) 
^Skinner, Doug (August 2005). "What's This? A Shaver Revival?". Fate. Archived from the original on August 23, 2009. Retrieved August 26, 2009. Shaver's main literary model was Abraham Merritt. Merritt isn't read much today, but his fantasy novels were quite popular throughout the '20s and '30s. Beginning with The Moon Pool in 1919, he produced a series of novels about underground caverns, lost races, ancient ray machines, shell-shaped hovercraft, and other marvels. He was also a member of the original Fortean Society and the editor of The American Weekly, a Sunday newspaper supplement that often featured scientific and historical oddities. Shaver thought Merritt had seen the caves but could only mention them in fiction. One might also suspect that Merritt's novels had influenced Shaver's beliefs.
^N. G. Christakos, "Three By Thirteen: The Karl Edward Wagner Lists" in Black Prometheus: A Critical Study of Karl Edward Wagner, ed. Benjamin Szumskyj, Gothic Press 2007. ISBN978-0913045145
^Moorcock and Cawthorn, Fantasy: The 100 Best Books, Carroll & Graf, (1988), p. 81-2,93-4.
^Robert Bloch, "Robert Bloch's Ten Favorite Horror-Fantasy Novels" in The Book of Lists : Horror. Amy Wallace, Scott Bradley, and Del Howison, New York : Harper, 2008. ISBN9780061537264 (p. 253)
^Also known as The Curse of the Doll People, this Mexican horror film is usually said to have been inspired by Tod Browning's The Devil-Doll. But a closer examination shows that it was adapted directly from Merritt's novel. The film includes many characters, situations, scenes and speeches from the novel, none of which are present in The Devil-Doll. Yet the film does not credit Merritt with the story; it gives that honor to screenplay author Alfredo Salazar instead.