<P> Erwin Chargaff ( 11 August 1905 -- 20 June 2002 ) was an Austro - Hungarian biochemist that immigrated to the United States during the Nazi era and was a professor of biochemistry at Columbia University medical school . Through careful experimentation , Chargaff discovered two rules that helped lead to the discovery of the double helix structure of DNA . </P>
<P> Erwin Chargaff ( 11 August 1905 -- 20 June 2002 ) was an Austro - Hungarian biochemist that immigrated to the United States during the Nazi era and was a professor of biochemistry at Columbia University medical school . Through careful experimentation , Chargaff discovered two rules that helped lead to the discovery of the double helix structure of DNA . </P>
who contributed to the discovery of dna structure
who contributed to the discovery of dna structure
Erwin Chargaff
Erwin Chargaff