Depends on which work we’re talking about. Louis Pasteur was an accomplished man and lived a full 72 years. He did so much work in numerous fields from biology to physics to chemistry. He served as a professor of physics at Dijon Lycee and professor of chemistry at the University of Strasbourg. He also had his own laboratory in his hometown of Arbois in eastern France. His most notable work was on germ theory and the invention of a process known as pasteurization which was accomplished while he was professor of chemistry and dean of sciences at the University of Lille.