Gertrude Belle Elion (January 23, 1918 – February 21, 1999) was a groundbreaking American biochemist and pharmacologist whose pioneering work transformed modern medicine. As one of the most influential women in STEM, Elion defied gender barriers in the mid-20th century scientific world, carving out a historic role in pharmaceutical research.
Elion joined the Burroughs Welcome pharmaceutical company (now part of GlaxoSmithKline), where she collaborated with George H. Hitchings. Together, they developed a revolutionary approach to drug design targeting the differences between healthy and diseased cells. This innovative method led to the creation of life-saving drugs for leukemia, malaria, bacterial infections, and gout.
One of her most celebrated achievements was the development of azathioprine, the first immunosuppressive drug used in organ transplants. She also played a key role in the creation of acyclovir, a breakthrough antiviral medication for treating herpes, and helped lay the groundwork for AZT, the first major treatment for HIV/AIDS.

In 1988, Gertrude Elion was awarded the Nobel Prize in Physiology or Medicine, becoming one of the few women at the time to receive this prestigious honor. She shared the award with Hitchings and Sir James Black for their discoveries of “important principles for drug treatment.”
Elion never earned a formal Ph.D., yet her impact on medical innovation and pharmaceutical research remains unmatched. Her legacy continues to inspire a new generation of scientists, particularly women pursuing careers in biotechnology, drug discovery, and healthcare innovation.