 Randi was a core contributor to the development of the OpenGL Shading Language and the OpenGL API that supports it, as well as one of the first programmers to design and implement shaders using this technology.He led the 3Dlabs team devoted to educating developers and helping them take advantage of new graphics hardware technology.In the late 1980s, he was a co-architect of PEX, a 3D graphics extension to the X Window System.