 Jean Stéphenne joined SmithKline-RIT (now GlaxoSmithKline Biologicals) in 1974 as head of bacterial and viral vaccines production, he became "Vaccine Production Director" in 1980.From 1981 to 1991, he served as Vaccine Plant Director and R&D Director.From 1988 to 1991, he was Vice President of Human Vaccines Research and Development and Production.