Herrick is a trustee of the Rationalist Association and was editor of its journal New Humanist for 18 years from 1984. He subsequently became literary editor of New Humanist until his retirement in 2005. He was the recipient of the second International Rationalist Award in 2002.
He was editor of International Humanist News, published by the International Humanist and Ethical Union (IHEU). In 1996 he received the Distinguished Humanist Service Award from the IHEU. He was a signatory to Humanist Manifesto II.
From January 1977 until 1981, Herrick edited The Freethinker. He later wrote that publication's centenary history. He was a founder member of the Gay and Lesbian Humanist Association.
- Humanism: An Introduction. (2003). ISBN 0-301-00301-7. (Also published by Prometheus Books, 2005. ISBN 1-59102-239-8)
- Humanist Anthology: From Confucius to David Attenborough. (1995). London, Rationalist Press Association. Edited by Margaret Knight; 2nd edition, revised by Jim Herrick. ISBN 0-301-94001-0
- Against the Faith: Some Deists, Skeptics and Atheists. (1985). London: Glover & Blair. ISBN 0-906681-09-X (Also published by Prometheus Books, 1994. ISBN 0-87975-288-2).
- Vision and Realism: A Hundred Years of The Freethinker. (1982). London: GW Foote & Co. ISBN 0-9508243-0-5
- http://newhumanist.org.uk/172 Selected articles for New Humanist
Based on the Wikipedia article of the same name.
- http://www.americanhumanist.org/Humanism/Humanist_Manifesto_III/Notable_Signers "Notable Signers" American Humanist Association Humanism and Its Aspirations
- http://www.secularism.org.uk/uploads/3547b5d209ea9e9116076299.pdf NSS Bulletin, Issue 38, Spring 2008, p.3
- http://www.secularism.org.uk/uploads/nss-annual-report-2010.pdf NSS Annual Report 2010, p.15