Julien Guertault has been working as a software engineer since 2004, in domains such as flight training, video games, virtual reality and rendering. He is also active in the digital art culture known as the demoscene, as part of the group Ctrl-Alt-Test, where he focuses on size coding and procedural generation. French born, he has spent nearly a decade in Japan, until he joined the Substance team at Adobe Inc., where he is now working on OpenPBR.