Jean Casimir Félix Guyon

Jean Casimir Félix Guyon (21 July 1831 – 2 August 1920) was a French surgeon and urologist born in Saint-Denis, Ile-Bourbon (Réunion).

He was appointed médecin des hôpitaux in 1864, and was later a professor of surgical pathology (from 1877) and genitourinary surgery (from 1890) at the University of Paris.

At Hôpital Necker he held clinics that were attended by students worldwide[citation needed] In 1907, he along with urologists from Europe, the United States and South America established the Association Internationale d'Urologie.

In 1979 he was commemorated on a postage stamp, issued by France on the occasion of the 18th Congress of the Association Internationale d'Urologie, held in Paris.

[2] Although he was primarily known for work with genitourinary anatomy, Guyon is credited with the discovery of the ulnar canal at the wrist.