Gautam Dasgupta is a professor of Civil Engineering and Engineering Mechanics at the Columbia University, New York. His areas of research include computer mathematics, waves in random media, earthquake engineering, and finite and boundary element analysis with Mathematica. For details on his recent work, see www.columbia.edu/~gd18.

Doctor Jacques Treil is a Neuro and Maxillo-facial Radiologist and a full member of the French Society of Neuroradiology, the European Society of Neuroradiology, and the French Orthodontics Society.