Justin Marie Jolly

Justin Marie Jolly (August 6, 1870 – February 1, 1953) was a French hematologist and histologist born in Melun, Seine-et-Marne.

He studied medicine at the Collège de France under Louis-Antoine Ranvier (1835-1922) and Louis-Charles Malassez (1842-1909) where he learned histological techniques and their correlation to other medical disciplines.

He was chef du laboratoire at the medical clinic in the Hôtel-Dieu de Paris, and director of the histological laboratory at the École des Hautes Etudes.

In the early part of the 20th century he produced the earliest films of mitosis in living cells via "microscopic movies".

Along with American physiologist William Henry Howell (1860-1945), the Howell-Jolly bodies are named; which are 1-2 μm granules seen in erythrocytes (red-blood cells).