Vincent du Vigneaud was an American biochemist. He was recipient of the 1955 Nobel Prize in Chemistry "for his work on biochemically important sulphur compounds, especially for the first synthesis of a polypeptide hormone," a reference to his work on the peptide hormone oxytocin. The Nobel Prize in Chemistry 1955, announced November 2, 1955. Vincent du Vigneaud, “for his work on biochemically important sulphur compounds, especially for the first synthesis of a polypeptide hormone”. Vincent du Vigneaud: born 1901, Chicago, IL, USA. Wiki link Data: the Nobel Foundation (CC0).