|Oswald Avery (Image credit, modified by me)|
Oswald Theodore Avery (1877-1955) was a distinguished Canadian-born bacteriologist and research physician and one of the founders of immunochemistry. He is best known for his discovery that deoxyribonucleic acid (DNA) serves as genetic material. The work of Avery and the members of his team at the Rockefeller Institute, observes Nobel laureate Dr. Joshua Lederberg, was "the historical platform of modern DNA research" and "betokened the molecular revolution in genetics and biomedical science generally."
Take a look at the The Oswald T. Avery Collection at the NIH.