- Regan, Tom19
- Cohen, Carl, 1931-6
- Gandhi, Mahatma, 1869-19485
- Singer, Peter, 1946-5
- Stevens, Christine4
- American Medical Association3
- Animal Welfare Institute3
- Culture and Animals Foundation2
- Descartes, Rene, 1596-16502
- Francione, Gary L. (Gary Lawrence), 1954-2
- Kant, Immanuel, 1724-18042
- Narveson, Jan, 1936-2
- Society for Animal Protective Legislation2
- Trans-Species Unlimited2
- Animal Liberation Front1
- Aristotle1
- Barker, Bob, 1923-1
- Barnard, Neal D., 1953-1
- Barnes, Donald J.1
- British Union for the Abolition of Vivisection1