Raph Levien

Raphael Linus Levien (also known as Raph Levien; born 1961) is an influential member of the free software developer community, through his creation of the Advogato virtual community and his work with the free software branch of Ghostscript. From 2007 until 2018 he was employed at Google. He holds a PhD in Computer Science from UC Berkeley. He also made a computer-assisted proof system similar to Metamath: Ghilbert. In April 2016, Levien announced a text editor made as a "20% Project" (Google allows some employees to spend 20% of their working hours developing their own projects): Xi.