David Parra-Guevara received his Doctor (Ph.D.) degree from the National Autonomous University of Mexico, Mexico, in 2001. In 2002, he held a postdoctoral position for one year as a visiting researcher at the Mexican Petroleum Institute. He is currently a senior researcher (Investigador Titular) at the Institute of Atmospheric Sciences and Climate Change of the National Autonomous University of Mexico. His research interests include air and water pollution control models, direct and inverse pollution problems, and numerical methods.