Hermann Emil Fischer (1852-1919)

German chemist, a student of Adolf von Baeyer and professor in Erlangen, Würzburg and Berlin. In 1875 he discovered phenylhydrazine, with which he characterized sugars as osazones, and in 1883 the indole synthesis that bears his name.

He established the configuration of glucose and the other sugars, introduced the Fischer projection, synthesized purines such as caffeine and uric acid and proposed the lock-and-key model for enzymes. He received the 1902 Nobel Prize in Chemistry for his work on sugars and purines.

More information: en.wikipedia.org