Roger Guillemin, French-American physician and endocrinologist, Nobel Prize laureate

Roger Charles Louis Guillemin (born January 11, 1924) is a French-American neuroscientist. He received the National Medal of Science in 1976, and the Nobel prize for medicine in 1977 for his work on neurohormones, sharing the prize that year with Andrew Schally and Rosalyn Sussman Yalow.