He is the co-author of The Portable Malcolm X Reader (Penguin Books, 2013) with Manning Marable and is currently working on a manuscript titled "Those Who Know Don’t Say": The Nation of Islam, Black Nationalist Politics, and the Carceral State (University of North Carolina Press). Felber helped found Liberation Literacy, a racial justice group inside Oregon prisons, and spearheaded the Prison Abolition Syllabus.