Greg Street is an American video game designer currently employed as Lead Game Designer for Riot Games.Street was previously employed by Blizzard Entertainment as Lead Systems Designer on the award-winning MMORPG World of Warcraft, and is also known by his screen name "Ghostcrawler" on the World of Warcraft forums and his own Twitter account. Prior to being employed by Blizzard, Street worked as a marine biologist, eventually moving into the game design field.