Frederick Sanger
Helmut Zahn (born June 13, 1916 in Erlangen; died November 14, 2004 in Aachen) was a German chemist who is often credited as the first to synthesize Insulin in 1963. His results synthesizing insulin were achieved almost simultaneously with that of Panayotis Katsoyannis at the University of Pittsburgh. His work was not honoured by the Nobel prize because in 1958 Frederick Sanger was the first who discovered the chemical structure of Insulin.