In 1986 she attended the Institute for Social Ecology and there began a collaborative relationship with Bookchin, working intensively with him over the next two decades in the explication of social ecology from their home in Burlington, Vermont.
From 1987 to 2000 she and Bookchin co-wrote and co-published the theoretical newsletter Green Perspectives, later renamed Left Green Perspectives. Bookchin considered her The Murray Bookchin Reader to be the best introduction to his work. Biehl is a supporter of the Kurdish rights movement in Turkey.
Abdullah Öcalan, leader of the insurgent Kurdistan Workers" Party, had become an avid reader of Bookchin"s work after he was captured and imprisoned in 1999 and tried to arrange a meeting with Bookchin before he died, but was unsuccessful.
Following the 2006 death of Bookchin, Biehl became involved in pro-Kurdish activism. She has since translated the 2011 book Democratic Autonomy in North Kurdistan from German into English.
She has written a biography of Bookchin, forthcoming from Oxford University Press.
She also opposes eco-feminism. In 1986 she attended the Institute for Social Ecology and there began a collaborative relationship with Bookchin, working intensively with him over the next two decades in the explication of social ecology from their home in Burlington, Vermont. She is the editor and compiler of The Murray Bookchin Reader (1997).
The author of The Politics of Social Ecology: Libertarian Municipalism (1998) and Rethinking Ecofeminist Politics (1991). And coauthor (with Peter Staudenmaier) of Ecofascism: Lessons from the German Experience (1995). She has also authored numerous articles about or related to Bookchin’s thought, especially libertarian municipalism, social ecology and eco-feminism.
In 2011 Biehl separated herself from social ecology, explaining that she could no longer advocate an anti-statist ideology, and reverted to her pre-1987 political identity as "what leftists call a social democrat".
