Doctors and scientists know more about diagnosing and treating cancer than ever before, thanks to the discoveries of the Cancer Genome Atlas. The atlas maps genetic mutations of 33 different cancers and collects more than 11,000 specimens. Jean Claude Zenklusen is director of the Cancer Genome Atlas Program Office at the National Cancer Institute. He and his colleague, Carolyn Hutter of the National Human Genome Research Institute, are Service to America medal finalists in the Science and Environment category. On In Depth with Francis Rose, he explains what the atlas entails. See a photo gallery of all the SAMMIES finalists.