A Hungarian radiochemist and Nobel laureate who used radioactive tracers to study the metabolism of animals. He also co-discovered the element hafnium.
He studied chemistry at the University of Budapest for one year before enrolling in the Technical University of Berlin and the University of Freiburg.
He was the first chemist to win the Nobel Prize in Chemistry after World War II, when the prize was not given for three years.
He had four children with his wife Pia Riis, who he married in 1924.
He is a Jewish Nobel laureate like Fritz Haber.