Sallie W. Chisholm

National Medal of Science

Biological Sciences

For contributions to the discovery and understanding of the dominant photosynthetic organisms in the ocean, promotion of the field of microbial oceanography, and influence on marine policy and management.

For contributions to the discovery and understanding of the dominant photosynthetic organisms in the ocean, promotion of the field of microbial oceanography, and influence on marine policy and management.

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Birth
January 1, 1947
Age Awarded
64
Country of Birth
USA
Key Contributions
Research in Photosynthesis and the Cyanobacterium, Prochlorococcus
Awarded by
Barack Obama
Education
Skidmore College
State University of New York at Albany
Areas of Impact
Energy & Environment
Affiliations
Massachusetts Institute of Technology
I

If you’ve taken a deep breath of fresh air today, you can thank Sallie “Penny” Chisholm. Well, actually you can thank a microorganism discovered by Chisholm and her team at MIT. In 1988, they uncovered the existence of a microscopic bacterium that is responsible for producing more than half of the oxygen in our planet’s atmosphere.

This microorganism, called Prochlorococcus, was completely unknown to science before then, but is now widely understood to be one of Earth’s most abundant photosynthetic organisms. It is also one of the oldest, being a direct descendent of the first photosynthetic cells that began pumping oxygen into Earth’s atmosphere over four billion years ago.

Chisholm has gone on to study almost every aspect of Prochlorococcus, from its genome to its impact on the whole ocean ecosystem, and how it is affected by climate change. As a joint professor of engineering and biology, she has built a multidisciplinary lab that brings together scientists and researchers from across a huge number of disciplines.

“I think of myself as a conductor of an orchestra,” she has remarked, “and they’re all playing different instruments... but you put it together and it makes for really beautiful music. It requires lots of collaboration and coordination...and it’s just incredibly fun to watch.”

Chisholm is dedicated to making sure that the groundbreaking research her lab does gets shared and communicated with the outside world. She is the co­author of three groundbreaking children’s books that explain photosynthesis and other ecological processes in terms anyone can understand. She has described the process of distilling complicated science down to its key elements as incredibly challenging, but also richly rewarding.

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