Rudolph Schoenheimer

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German-American biochemist who developed the technique of isotope tagging of biomolecules, enabling detailed study of metabolism. This work revealed that all the constituents of an organism are in a constant state of chemical renewal. He further established that cholesterol is a risk factor in atherosclerosis. After graduating in medicine from the Friedrich Wilhelm University in Berlin, he learned further organic chemistry at the University of Leipzig and then studied biochemistry at the University of Freiburg where he rose to be Head of Physiological Chemistry. He spent the 1930-1931 academic year at the University of Chicago. In 1933, following the rise of the Nazis to power he emigrated from Germany to the Columbia University to join the department of Biological Chemistry. Working with David Rittenberg, from the radiochemistry laboratory of Harold C. Urey and later together with Konrad Bloch, they used stable isotopes to tag foodstuffs and trace their metabolism within living things. He suffered from manic depression all of his life, which led to him committing suicide using cyanide on 11 September 1941, aged 43. Link to Wikipedia biography