Life and Work of an Important Scientist
Chargaffs' work in understanding DNA is very important. With his work and studies, he discovered how the four base pairs of DNA matched together. Chargaff's Rule, which states that an organism should have a base pair ratio of 1:1, (Adenine equals Thymine and Guanine equals Cytosine) laid the groundwork that led to the work of James Watson and Francis Crick.
There are big controversies over his work, mostly about how he didn't win a Nobel Prize for his work.
Chargaff died in New York City, on June 20th, 2002, at the age of 96.