I have been programming 3D graphics software for the last 15 years. I was one of the core developers of Poser, the 3D character art and animation software. My main areas of expertise include NPR and PBR rendering using OpenGL, REYES and path tracing. In addition, I was responsible for embedding and extending the Cycles render engine into Poser, bringing Poser to the 64 bit and Cocoa age, integration of Kinect hardware, integration of wxPython scripting and other features.
If you're interested in looking at some of my code, here are my contributions to the Blender code base.