M. le Dr. Denucé, professeur-adjoint de clinique chirugicale à l'École de Médicine de Bordeaux.
"The first report to describe an incubator developed for care of the premature infant was written by Jean-Louis-Paul Denucé (1824-1889) of Bordeaux, France. About 400 words long, citing no references, and published in the Journal de Médecine de Bordeaux in 1857, it described a double-walled zinc tub in which the space between the walls was filled with warm water." -- Thomas E. Cone, Am. J. Dis. Child. 135:658-660, July 1981.
Image of Dr. Denucé is from the NLM Historical Images in Medicine web site. Image of the zinc tub is from Hess, 1922.