David Rittenberg

David Rittenberg (November 11, 1906 – January 24, 1970) was a U.S. biochemist who pioneered the radioactive tagging of molecules, enabling detailed studies of metabolism. These studies resulted in a change in the prevailing scientific theory, from a static, 'wear and tear' view of metabolic processes, to a dynamic theory in which constant and rapid buildup and degradation of body constituents takes place.