Arthur Machen (1863-1947) was the influential fantasist author of such works as "The Great God Pan" which is mentioned in many of Lovecraft's stories. Other works include "The House of Souls."
("The Dunwich Horror," "The Call of Cthulhu," "The Whisperer in Darkness")
See also: The Great God Pan
Miskatonic University Department of Literature: Arthur Machen