Algernon Blackwood was born in Shooter's Hill and educated at Wellington College. His father was a Post Office administrator who, according to Peter Penzoldt, "though not devoid of genuine good-heartedness, had appallingly narrow religious ideas." Blackwood had a varied career, farming in Canada, operating a hotel, as a newspaper reporter in New York City, and, throughout his adult life, an occasional essayist for various periodicals. In his late thirties, he moved back to England and started to write stories of the supernatural. He was very successful, writing at least ten original collections of short stories and eventually appearing on both radio and television to tell them. He also wrote fourteen novels, several children's books, and a number of plays, most of which were produced but not published. He was an avid lover of nature and the outdoors, and many of his stories reflect this.
H.P. Lovecraft wrote of Blackwood: "He is the one absolute and unquestioned master of weird atmosphere."
Among his thirty-odd books, Blackwood's series about John Silence, were the most popular. Blackwood also wrote light fantasy and juvenile books.