In the modern world, if one could ask only one person about the art and science of origami, that one person might be Dr. Robert J. Lang. Through his corpus of work, Dr. Lang has brought together origami with mathematics, frequently drawing on his own background and education as a physicist and engineer. He has authored a number of books on the subject of origami, and has also been an invited guest at international conventions across the globe. Now visitors to the web can peruse some of his writings on the mathematics behind origami, including the importance of finding proportions and tree theory. Of course, visitors will not want to miss some lovely photographs of his latest creations, which include a blue heron, an allosaurus skeleton and a poised mountain goat.