Robin Eric Hahnel (born March 25, 1946) is a Professor of Economics at Portland State University. He was a Professor at American University for many years and has traveled extensively advising on economic matters all over the world. He is best known for his work on participatory economics with Z Magazine editor Michael Albert.

Hahnel is a radical economist and political activist. Politically he considers himself a product of the New Left and is sympathetic to libertarian socialism. He has been active in many social movements and organizations for forty years, notably as a participant in student movements opposed to the American invasion of South Vietnam, more recently with the Southern Maryland Greens, a local chapter of the Maryland Green Party, and the Green Party of the United States. Hahnel's work in economic theory and analysis is informed by the work of Marx, Keynes, Piero Sraffa, Michał Kalecki, and Joan Robinson, among others. He has served as a visiting professor or economist in Cuba, Peru, and England.

Cindy Milstein is an anarchistactivist and educator who talks at various anarchist and socialist gatherings. One such talk was the very informal but in-depth class, "Anarchism 101" at the National Conference on Organized Resistance, at the American University in Washington DC, in 2003 and 2004. (See the NCOR Web site for other talks by Milstein each year, including in the new Radical Theory Track.) Milstein's presentation covers the philosophical roots of anarchism and its evolution to the present, including pre-anarchist ideas of liberty, the anarchist-communist split, and a number of different anarchist philosophies, among other things.

She has also been involved with the Institute for Social Ecology, and is currently a board member with the Institute for Anarchist Studies and a co-organizer of the Renewing the Anarchist Tradition conference. Milstein speaks regularly in public, at anarchist conferences and bookfairs as well as radical spaces, including the Finding Our Roots conference, the Unschooling Oppression conference, the Montreal Anarchist Bookfair, the Bay Area Bookfair, the New York Anarchist Book Fair, and Left Forum, among others. She most recently worked to help organize A New World from Below: An Anarchist & Antiauthoritarian Convergence at the 2010 United States Social Forum in Detroit, Michigan. Her essays are published in several recent anthologies--"Anarchism and Its Aspirations" (AK Press, 2010), "Realizing the Impossible: Art against Authority (AK Press, 2007), Globalize Liberation (City Lights, 2004), Confronting Capitalism (Soft Skull, 2004), and Only a Beginning (Arsenal Pulp Press, 2004) as well as on the Free Society Collective Web site. She is also a collective member of the all-volunteer Black Sheep Books in Montpelier, Vermont.