Leonard Weinberg is Foundation Professor Emeritus in Political Science at the University of Nevada, a senior fellow at the National Security Studies Center at the University of Haifa (Israel) and a Fellow at the Center for the Prevention of Terrorism in Oklahoma City. Over the course of his career he has been a Fulbright senior research fellow for Italy, a visiting scholar at UCLA, a guest professor at the University of Florence, and the recipient of an H. F. Guggenheim Foundation grant for the study of political violence. He has also served as a consultant to the United Nations Office for the Prevention of Terrorism (Agency for Crime Control and Drug Prevention).

For his work in promoting Christian-Jewish reconciliation Weinberg was a recipient of the 1999 Thornton Peace Prize. In 2011 he won Distinguished Faculty of the year award from the University of Nevada. In 2005 he participated in the planning for the Madrid Summit Conference on Democracy, Terrorism and Security. His books include  The End of Terrorism (2011), Global Terrorism (2005), Political Parties and Terrorist Groups (2003, with Ami Pedahzur), Right-Wing Extremism in the Twenty-First Century (2003, eds. with Peter Merkl), Religious Fundamentalism and Political Extremism (2003, eds. With Ami Pedahzur) The Democratic Experience and Political Violence (2001, eds. with David Rapoport), The Emergence of a Euro-American Radical Right (1998, with Jeffrey Kaplan). His articles have appeared in such journals as The British Journal of Political Science, Comparative Politics, and Party Politics. He is the senior editor of the journal Democracy and Security.