Charles Hall is a systems ecologist with strong interests in biophysical 
economics, and the relation of energy to society. Central to Hall's work is 
an understanding that the survival of all living creatures is limited by 
the concept of energy return on investment (EROI): that any living being or 
living society can survive only so long as they are capable of getting more 
net energy from any activity than they expend during the performance of 
that activity. He is the author or co-author of, among others, Energy and 
the Wealth of Nations,

John Horning is executive director of Wild Earth Guardians. Their mission 
statement reads: "We believe in nature's right to exist and thrive. We act 
on this belief with compassion and courage by preserving the wild world. We 
defend wildness, empower life, end injustice, and stand for healthy, 
sustainable ecosystems and human communities. We embrace conflict, and 
cooperate without compromising our values. We execute the campaigns 
strategically and decisively, we mobilize, inform and inspire others, and 
we work to heal wounded landscapes. Our enduring and fierce advocacy leads 
us to success. We are A FORCE FOR NATURE."He is grateful to live in  New 
Mexico and feels privileged to be a voice for the voiceless.

James Tracy said of her: Roxanne Dunbar-Ortiz has defined the term engaged intellectual through a life spent on the frontlines of the past four decades of social struggles. She has never abandoned her roots through the process of becoming one of the most respected Left academics in the United States." She is the author of Red Dirt, Outlaw Woman, Blood on the Border, Roots of Resistance, and The Great Sioux Nation, which was just rereleased.