Mary-Dell Chilton, Mother of Genetically Modified Crops, Dies at 87

By the Editorial Team · Saturday, July 25, 2026

Mary-Dell Chilton, a pioneering scientist who helped create the first genetically modified plant, died at age 87 in North Carolina. Her foundational research paved the way for modern genetically engineered crops, which now make up over 90% of certain U.S. agricultural products and have transformed global farming practices.

Mary-Dell Chilton, a pioneering figure in agricultural biotechnology and widely recognized as a founder of genetically modified crops, died on June 24 at her home in Carrboro, North Carolina. She was 87 years old.

Chilton’s groundbreaking work began in the early 1970s while she was a part-time chemistry instructor at the University of Washington in Seattle. At the time, she encountered a scientific paper claiming that the soil bacterium Agrobacterium tumefaciens was capable of transferring its own genes into plant DNA, causing tumors in crops such as grapes and stone fruits. Initially skeptical of the claim, Chilton sought to disprove it, only to ultimately confirm and elucidate the mechanism behind this natural genetic transfer. Her research laid the foundation for developing techniques to create transgenic plants by integrating desired genes into crops.

In 1982, Chilton led a team that successfully engineered the first transgenic plant by inserting a yeast gene into a tobacco plant, demonstrating that the modified DNA could be inherited by subsequent generations. This milestone marked the beginning of biotechnological advances that have since transformed agribusiness worldwide. More than 90% of corn, soybeans, canola, and cotton grown in the United States today are genetically modified, largely to enhance resistance against pests and herbicides.

Despite her achievements, Chilton faced challenges early in her career, including limited academic opportunities. She was unable to secure a tenure-track position at the University of Washington, prompting her and her husband, Scott Chilton, also a chemist, to accept positions at Washington University in St. Louis in 1979. There, she continued her research before joining the private sector in 1983, taking on a leadership role at Ciba-Geigy—later Syngenta—in Research Triangle Park, North Carolina. At Syngenta, she established the company’s first biotechnology laboratory and rose to key scientific and executive positions.

Chilton received numerous recognitions for her contributions, including the World Food Prize in 2013 and the National Medal of Technology and Innovation from President Joe Biden in 2023. Officials noted that her innovations have helped farmers worldwide protect crops against disease, pests, and environmental stresses.

Throughout her career, Chilton remained focused on the science rather than public debate, often emphasizing that questions about genetically modified organisms (GMOs) were societal rather than scientific. GMOs have sparked ongoing controversy and regulatory challenges globally, but Chilton maintained that they are safe and essential tools for modern agriculture.

Born Mary Dell Matchett II on February 2, 1939, in Indianapolis, Chilton was raised primarily in North Carolina before moving to suburban Chicago for high school. She showed an early aptitude for science, attending the University of Illinois where she earned her Ph.D. in chemistry in 1967. Married to Scott Chilton in 1966, she had two sons.

Mary-Dell Chilton’s legacy endures in the widespread adoption of genetically engineered crops and the ongoing innovation in plant biotechnology that her work helped enable.

This article was reported by synthesizing coverage from multiple independent news outlets to present a balanced, unbiased account. Read about our editorial standards. Spotted an error? Let us know.