Dr. Tam O'Shaughnessy is cofounder of
Sally Ride Science and executive director of
Sally Ride Science at UC San Diego. Tam grew
up in California and played professional tennis
from 1971 to 1974. She later earned B.S. and
M.S. degrees in biology from Georgia State
University and a Ph.D. in school psychology from the University of California, Riverside.

Tam has written 12 children's science books, including six with Sally Ride. They received the American Institute of Physics Children's Science Writing Award in 1995 for The Third Planet. In 2015 Tam published Sally Ride: A Photobiography of America's Pioneering Woman in Space.

As a scientist and educator, Tam became concerned about the underrepresentation of women in science and technical professions. In 2001, Sally, Tam, and three friends—Karen Flammer, Terry McEntee, and Alann Lopes—founded Sally Ride Science to try to narrow the gender gap in science. Tam served as the company's chief creative officer, guiding creation of the Cool Careers in STEM and Key Concepts in Science programs. She was also chief operating officer from 2009 to 2013, chair of the Board of Directors from 2013 to 2015, and chief executive officer from 2014 to 2015.

The University of California, San Diego, acquired Sally Ride Science in October 2015 and named Tam executive director of the resulting nonprofit organization.