Dr. Ruth L. Kirschstein (1926-2009) was not a household name, but she was the essential architect of the American scientific enterprise.For over fifty years, Kirschstein quietly navigated the complex, high-stakes world of the National Institutes of Health (NIH), rising from pathologist and polio vaccine regulator to become the first female Director of a major NIH Institute. She was the institution's moral compass, serving multiple tenures as Acting NIH Director and earning the unofficial title, "Mother of the Biomedical Workforce."This comprehensive biography reveals how Kirschstein secured the future of American medicine by making one single, powerful policy choice: she built and defended the National Research Service Award (NRSA) training program, which now bears her name. Her strategic funding of basic science, her unwavering defense of the peer review system, and her commitment to ethical leadership ensured that every major biomedical breakthrough of the past half-century-from genetics to targeted cancer therapies-rested upon the stable foundation she created.A Steward of Science is the story of a pioneering woman and a dedicated public servant whose true genius lay not in discovery, but in the principled stewardship of the systems that make all discovery possible. Her legacy is the robust, ethical, and enduring scientific enterprise we rely on today. Approx.174 pages, 31200 word count