Hans Fischer (1881-1945) was a German organic chemist. Fischer's scientific work was mostly concerned with the investigation of the constitutive properties of the pigments in blood, bile, and also leaves, as well as with the chemistry of pyrrole. Fischer received the Nobel Prize for 1930, for his work on the chemistry of pyrrole and the synthesis of haemin. He committed suicide in Munich after his institute and his work were destroyed during the last days of World War II.