José Guillermo Sánchez León (http://diarium.usal.es/guillermo) is an engineer, physicist and mathematics PhD holder. He is currently a mathematics and statistical consultant and teaches Mathematical modeling at the University of Salamanca. He has worked in the energy industry and conducted research in a variety of fields: Modeling, optimization, medical physics, astronomy, finance and others. In 1999, he was awarded a research grant at Wolfram Research Inc. headquarters in Champaign (Illinois, USA) after his statistical applications with Mathematica project won a competition sponsored by the company. Since then, he has been an active Mathematica and webMathematica alpha and beta tester. He is also a Wolfram certified instructor and has extensive experience in teaching and developing programs with both applications. Among his more than 100 articles, there are several where Mathematica and webMathematica have been used extensively.