Christopher Slowe

Christopher Slowe (Reddit username 'KeyserSosa') holds a PhD in physics from Harvard and was Reddit's first employee, joining Steve Huffman and Alexis Ohanian out of Y Combinator's 2005 batch and helping build the site's early ranking and anti-spam systems. He is generally credited among Reddit's founding team and remained its longest-serving early employee until departing in 2010 to become chief scientist at Hipmunk. He returned to Reddit in 2017 and served as Chief Technology Officer, scaling the company's engineering organization through its growth years and its 2024 IPO. He has been described as one of the principal technical architects behind Reddit's platform.