Mark J. Hadley, also known by his company name Parsec Productions, is a video game developer and the creator of the original Slender. He also composed the music for Slender: The Arrival. On the one year anniversary of the release of Slender: The Eight Pages, Hadley announced on his Twitter that he is moving on from Slender to make other games non-related to The Slender Man Mythos.

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