Gérard Henri de Vaucouleurs (April 25, 1918–October 7, 1995) was a French-American astronomer.
He had an early interest in amateur astronomy and received his undergraduate degree in 1939 at the Sorbonne in Paris. After military service in World War II, he resumed his pursuit of astronomy.
Fluent in English, he spent 1949–1951 in England and 1951–1957 in Australia, the latter at Mount Stromlo Observatory. In 1960 he was appointed to the University of Texas, where he spent the rest of his career.
He specialized in the study of galaxies and was co-author of the Third Reference Catalogue of Bright Galaxies.
The de Vaucouleurs modified Hubble sequence is a widely used variant of the standard Hubble sequence
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