Joan Ehrenfeld
Joan Gardner Ehrenfeld (1948 – 2011) was an American environmental scientist who was a professor at Rutgers University. Her research considered invasive species and ecology. She was elected Fellow of the American Association for the Advancement of Science in 2000.

Early life and education
Ehrenfeld was born in New York City. Her mother was a violinist, but encouraged Ehrenfeld to have a career in the sciences. Ehrenfeld said she remembered reading Paul de Kruif's Microbe Hunters as a child. As a teenager, the National Science Foundation selected her for a summer placement in the laboratory of Donald Ritchie at Barnard College. She returned to Barnard College for undergraduate studies, where she specialized in biology. She also completed a summer program at Colorado State University, and spent time working in a molecular biology lab. Ehrenfeld moved to Harvard University, where she earned a master's degree in 1970. She was a doctoral researcher at the City University of New York, where she studied the ecological interactions of Euphorbia.

Research and career 
In 1976, Ehrenfeld was appointed to the faculty in the Center for Coastal and Environmental at Rutgers University. She was made Director of the New Jersey Water Resources Research Institute in 1990. Ehrenfeld worked on wetlands ecology and was particularly interested in the relationships between biodiversity and human disease. She extensively studied the spread of the West Nile virus.

Ehrenfeld investigated how the Berberis thunbergii (Japanese barberry) impacted soil processes and micro-organisms. She found that barberry tissue is high in nitrogen-rich compounds akaloids, which causes a loss of organic matter in nearby soil due to excessive nitrogen cycling. As barberry starts to decompose, the nitrate levels in nearby soil start to increase, making the areas susceptible to weeds. Ehrenfeld removed barberry in the Morristown National Historical Park and attempted to restore native shrubs (spice-bush and witch-hazel). These native plants could not survive, as the barberry had transformed the soil itself. She thus showed that just one plant can have a dramatic impact on its environment.

In 2012, the Ecological Society of America launched the Ehrenfeld Award to celebrate her contribution to urban ecology. In 2019, the New York–New Jersey Trail Conference established the Joan Ehrenfeld Award for Responsible Stewardship.

Selected publications

Awards and honours
1999 Cook College Academic Professional Excellence Award for Academic Innovation and Creativity
2000 Elected Fellow of the American Association for the Advancement of Science
2003 Research Excellence and Impact Award
Science Advisory Board of the United States Environmental Protection Agency
2010 Elected Fellow of the Society of Wetland Scientists
2011 Research Excellence Award from the School of Environmental and Biological Sciences

Personal life
Ehrenfeld had four children. Her husband, David Ehrenfeld, was a professor of biology at Rutgers University. In 2010, she was diagnosed with leukemia. She was an examiner for Swarthmore College. She was a member of the Jewish community, and dedicated her weekends to music and the choir. Ehrenfeld died on June 25, 2011.

References

1948 births
2011 deaths
Scientists from New York City
Barnard College alumni
Harvard University alumni
City University of New York alumni
Rutgers University faculty
Environmental scientists
American people of Jewish descent
Fellows of the American Association for the Advancement of Science
Deaths from leukemia