Born in Providence, Rhode Island on August 20, 1890, Howard Philips Lovecraft would come to be considered one of the most influential American horror authors of the 20th century
He is best known for the creation of what has become known as the Cthulhu Mythos, a series of stories and novels that feature a pantheon of cosmic entities so horrible and incomprehensible to the human mind that the mere knowledge of their existence is enough to drive a person insane. These tales of cosmic horror were often set in his native New England, and they featured a number of memorable fictitious Massachusetts towns such as Arkham (home of the equally fictitious Miskatonic University), Innsmouth, and Dunwich. Lovecraft also created the concept of the Necronomicon—an ancient book containing secret knowledge pertaining to these Great Old Ones.
Other authors, such as Lovecraft’s friend and publisher August Derleth, would go on to write their own stories of the Mythos, elaborating and expanding on the themes, settings, and mythology of Lovecraft’s bleak and fascinating universe.
Lovecraft died in 1937 of intestinal cancer. He was 46.

Lovecraft's original sketch of Cthulhu
I came across the above image on the Ectoplasmosis! blog. They do a regular feature with the fiendishly clever name Cthulhu Cthursday (a name I wish I had come up with!). I wonder what Lovecraft would have thought if someone had told him that his work would be so revered and influential (as well as controversial) 119 years after his birth?