Richard is a writer, psychologist, and animal rights advocate. He coined the term "speciesism" in 1970 and was one of the first to use the term "Sentientism" in a positive light, after it was first used in a derogatory sense by John Rodman in 1977 to criticise Peter Singer and Richard's thinking.

Richard developed the term sentientism in a naturalistic context – using evidence and reason to infer sentience and to grant moral consideration to sentient beings. Richard still considers himself a Sentientist in this naturalistic context today. He has also developed painism, a sub-set of the sentientist worldview that focuses on the moral importance of pain over that of positive experiences and aims to resolve the tensions between rights and utilitarian approaches.

Richard on Wikipedia