Jean Demaison studied chemical engineering at the École Nationale Supérieure des Industries Chimiques in Nancy, France, from 1964 to 1967. After being awarded his diploma in October of 1967, he obtained a position at the French Centre national de la recherche scientifique (CNRS) as Researcher in the theoretical chemistry laboratory at the University of Nancy. He received his Ph.D. in 1972, in this laboratory on the topic “Internal rotation of two top molecules in rotational spectroscopy” under the direction of Prof. Jean Barriol, in conjunction with research he carried out in Freiburg, Germany, under the direction of Prof. Heinz Dieter Rudolph. He was invited professor at the University of Ulm from February 1974 to June 1975. He was promoted Research Director at CNRS in 1985. From 2001 to 2004, he was Guest Professor at the University of Louvain-La-Neuve, and from 2006 to 2008, at the Free University of Brussels. He was also Visiting Scientist in several laboratories (Austin, Kiel, Mühlheim, Valladolid). Jean Demaison published more than 370 papers and 22 books. He received the Sixth International Barbara Mez-Starck Prize for outstanding contribution in the field of structural chemistry, Austin, March 2008.