 AAAS fellow Joan Ehrenfeld, an expert on invasive species, wetlands ecology, and urban ecology, died at her home in Highland Park, New Jersey on June 25, 2011, after a year-long battle with acute leukemia.Throughout his life, Ehrenfeld has written a number of books elaborating on the issues of social ecology and the ever-present dangers of technology.From 1970-1980, Ehrenfeld published "Biological Conservation", "Conserving Life on Earth", "The Arrogance of Humanism", and "The Chameleon Variant".