William Eckhardt, Ph.D, was a mathematician, peace researcher and peace activist. He was the father of Chris Eckhardt, who was a plaintiff in the 1969 US Supreme Court case Tinker v. Des Moines, which established the 1st Amendment rights of students and teachers within the public schools.
- War-related Deaths Since 3000 B.C., by William Eckhardt, Bulletin of Peace Proposals 22(4):437-443, 1991
- Pioneers of Peace Research, by William Eckhardt, 01 June, 1983
- Civilizations, Empires and Wars: A Quantitative History of War, by William Eckhardt, 01 November, 1992
- Ideology and Personality in Social Attitudes, by William Eckhardt, 01 June, 1969