Northrop, John Howard (1891–1987)

US chemist. He was awarded the Nobel Prize for Chemistry in 1946 for his work in the 1930s when he crystallized a number of enzymes, including pepsin and trypsin, showing conclusively that they were proteins. He shared the award with Wendell Stanley and James Sumner.

Northrop was born in Yonkers, New York, and studied at Columbia University. In 1916 he was appointed to the staff of the Rockefeller Institute, where he remained for the rest of his career.