Tom Regan is an American philosopher known for his work in animal rights and ethics. He is a prominent advocate for the moral consideration of animals and has written extensively on the subject. His influential book, *The Case for Animal Rights*, argues that animals have inherent value and deserve protection from exploitation. Regan's philosophy is rooted in the belief that all beings with a life have rights, which challenges traditional views on human superiority. He is associated with the animal rights movement and has contributed to discussions on environmental ethics and moral philosophy, shaping contemporary debates on how society treats non-human animals.