Jacques-Louis David
Portrait of Monsieur Lavoisier and his Wife (1788). Oil on canvas. 259.7 x 196 cm. The Metropolitan Museum of Art, New York.
Antoine-Laurent de Lavoisier's wife helped him with his research. In modern times, she would have been credited as a colleague or partner. Lavoisier sometimes is called the Father of Modern Chemistry. In addition to other contributions, he stated the law of conservation of mass, dispoved the theory of phlogiston, wrote the first list of elements, and introduced the metric system.