![Painting of Louis Pasteur in the lab by Albert Edelfelt, 1885.](http://static.sciencelearn.org.nz/images/images/000/001/365/full/Louis_Pasteur_-_1885.jpg?1674166026)
Louis Pasteur (1822-1895) was a French chemist who made several key discoveries. He proved that infectious diseases were caused by microorganisms, developed the first vaccines and invented pasteurisation.
Painting of Pasteur by Albert Edelfelt, 1885.