Hans Spemann
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![Hilde Mangold in 1924 – shortly afterwards she was killed in a domestic fuel explosion.](/Images/godic/202502/12/Hilde_Mangold4241.jpg")
Hans Spemann (27 June 1869 – 9 September 1941) was a German embryologist who was awarded a Nobel Prize in Physiology or Medicine in 1935 for his discovery of the effect now known as embryonic induction, an influence, exercised by various parts of the embryo, that directs the development of groups of cells into particular tissues and organs.