Its initial publications were issues of the Call of Cthulhu fanzine Book of Dark Wisdom.

[1] As a book publisher, ESP is primarily a self-publishing venture for Jones, who has written several novels and edited numerous anthologies released under the imprint.

Its first book was Stanley C. Sargent’s Ancient Exhumations +2, a collection of Lovecraftian short fiction published in 2004.

They were distributed by the Independent Publishers Group (IPG) and, at the height of the company's activity, had titles carried by major booksellers such as Borders Books and Barnes & Noble.

[3] ESP published the following issues of The Book of Dark Wisdom, a magazine that started as a Call of Cthulhu fanzine, but later evolved into a more mature publication with original articles, poetry, fiction, and features by notable and upcoming authors in the horror and RPG genre.