Jean-Simon Bourdier (d. 1839) is one of the most important Parisian horologists of the late 18th century and first quarter of the 19th century. He became a master on September 22, 1787 and immediately became known for the perfection of his movements. In the early 19th century, he worked with the clockmaker Godon, the designer Dugourc and the sculptor Pierre Julien, producing several remarkable pieces destined for the Spanish king Charles IV. In parallel, he worked with the most influential merchants of the time, and particularly Daguerre and Julliot, carefully choosing the artisans who collaborated with him in the production of fine clocks. Among them, one should mention the chaser Rémond, the cabinetmaker Schwerdfeger and the enamellers Dubuisson and Coteau.