Colleen Eren, Ph.D., is full professor of Sociology and Criminal Justice at William Paterson University. She is also a research fellow at the Segal Center for Academic Pluralism, a senior fellow at the Niskanen Center and Reason Foundation, an expert at the Crime and Justice Research Alliance, and a featured speaker at Heterodox Academy. Colleen is the author of four books, Reform-Nation: The First Step Act and The Movement to End Mass Incarceration , The Impact of Supreme Court Decisions on U.S. Institutions, and Bernie Madoff and the Crisis: The Public Trial of Capitalism, as well as a book of poetry, Rip Currents. She is a frequent commentator on social issues, appearing in print (New York Times), television (Washington Journal), documentaries, and podcasts (Sorry Not Sorry with Alyssa Milano).

Prior to entering academia, she was Director of Organizing at New Yorkers Against the Death Penalty, which led a successful statewide campaign to end capital punishment. She is vice president of the board of New Hour for Women and Children, which helps women in reentry. She lives in Huntington, New York.