author
1845–1893
A 19th-century French mathematician and engineer, he is remembered for elegant work in differential geometry that left his name attached to several curves, transformations, and geometric ideas.

by Albert Ribaucour
Born in 1845 and dying in 1893, Albert Ribaucour is chiefly known today for contributions to geometry, especially the study of curves and surfaces. His name survives in terms such as the Ribaucour transformation and the Ribaucour curve, which reflect the lasting impact of his work on classical differential geometry.
He also trained and worked as an engineer, a background that fits the practical and visual character of much 19th-century French mathematics. Although he is not as widely known as some of his contemporaries, his ideas continued to matter long after his lifetime and still appear in mathematical writing and historical discussions of geometry.
Reliable portrait material was not clearly available from the sources I could confirm here, so no author image is included.