He has been involved in presenting OpenGL-related courses at SIGGRAPH since 1998. He is an author of The OpenGL Programming Guide (5th Edition; Addison Wesley; 2005), the OpenGL Reference Manual (4th Edition; Addison Wesley; 2004), co-author of The OpenGL ES 2.0 Programming Guide (1st Edition; Addison-Wesley), and the series editor for all Addison-Wesley OpenGL texts. He has authored and presented courses on OpenGL for over a decade worldwide, including authoring the original OpenGL course taught at SGI. He has a bachelors of science in mathematics from the University of Delaware. Ed Angel