Jean F. Letessier has been CNRS researcher at the University of Paris since 1978. Prior to that he worked at the Institut de Physique Nucleaire, Orsay where he obtained his thesis on Hyperon-Nucleon Interaction in 1970, under the direction of Prof. R. Vinh Mau, and was a teaching assistant at the University of Bordeaux. Since 1972 he has made numerous contributions to the research area of thermal particle production and applied mathematics.