WINTERSTEIN, ALFRED (1899–1960), Swiss biochemist. Winterstein was born in Zurich where his father, Ernest Heinrich Winterstein (1865–1949), was professor of chemistry. He joined the faculty of Zurich's Polytechnicum (1934). He became a senior director of the Hoffmann-La Roche Company in Basle. His fields of research included hematology, vitamins and carotenoids, and hormones.