Hermann Emil Fischer
Fischer's scientific work was mostly concerned with the investigation of the pigments in blood, bile, and also chlorophyll in leaves, as well as with the chemistry of pyrrole from which these pigments are derived. Of special importance was his synthesis of bilirubin and haemin. He received many honours for this work, and received the Nobel Prize in 1930. The lunar crater Fischer was named after him (and Hermann Emil Fischer) in 1976.