He worked in industry for thirteen years. Since 1982, he has been a community activist and human rights advocate. He is known for his research into extreme right, racist, and anti-Semitic organizations in the United States.
He is a lifetime member of the NAACP, and has served on the board of directors of the Petra Foundation, and the Kansas City Jewish Community Relations Bureau.
- 1998 MacArthur Fellows Program
- 1992 Petra Foundation Fellowship
- "Racism, Anti-Semitism and the Murder of Dr. Tiller". The Huffington Post. June 2, 2009. Retrieved July 25, 2014.
- Blood and Politics: The History of White Nationalism from the Margins to the Mainstream, Macmillan, 2009, ISBN 978-0-374-10903-5
What favorable timing, then, for Leonard Zeskind's "Blood and Politics: The History of the White Nationalist Movement From the Margins to the Mainstream," which addresses all of these issues, provides a context in which to assess them and offers an extended look inside a little-understood cultural zone that is really a panoply of small groups.
- Staff & Board. Irehr.org (2009-09-18). Retrieved on 2010-10-23.
- "Book Review: 'Blood and Politics' by Leonard Zeskind". Los Angeles Times. June 14, 2009. Retrieved July 25, 2014.
- Eric Banks (June 24, 2009). "NBCC Featured Review: Art Winslow on Leonard Zeskind". Critical Mass. National Book Critics Circle Board of Directors. Retrieved 2010-10-23.
- Author's website
- "Leonard Zeskind: Blood and Politics", Open Source Audio
- "Right-Wing Extremism Expert Leonard Zeskind Analyzes the Movement That Nurtures Shooters Like Von Brunn and Roeder", Buzzflash, 06/11/2009
- "Leonard Zeskind on the Minutemen", Everyday Citizen, Stuart Elliott, March 19, 2008
- Leonard Zeskind featured on Real Law Radio, Leonard talks with Bob DiCello on the legal news talk radio program, Real Law Radio, about the infiltration of the Tea Party Movement by white supremacists (Podcasts/Saturday March 27, 2010).